| Dec 31,
2020 | Dec 31,
2021 | Dec 31,
2022 | Dec 31,
2023 |
|---|
| Net income | 127 | 93 | 175 | 327 |
|---|
| Depreciation and amortization | 36 | 53 | 72 | - |
|---|
| Depreciation, amortization, and impairment | - | - | - | 72 |
|---|
| Deferred income taxes | 16 | -20 | -5 | -199 |
|---|
| Stock-based compensation expense | 32 | 49 | 75 | 73 |
|---|
| Deferred compensation plan | - | - | -16 | 14 |
|---|
| Amortization of Debt Issuance Costs | 1 | 6 | 7 | - |
|---|
| Amortization And Write-Off Of Debt Issuance Costs | - | - | - | 7 |
|---|
| Change in fair value of derivative | 0 | 10 | 27 | -5 |
|---|
| Foreign currency remeasurement (gain) loss | 25 | -0 | -6 | 0 |
|---|
| Other | - | - | -3 | -21 |
|---|
| Accounts receivable | -12 | 36 | 61 | 5 |
|---|
| Prepaid and other assets | -12 | -14 | -14 | -4 |
|---|
| Accounts payable, accruals, and other liabilities | 48 | 50 | 29 | 69 |
|---|
| Deferred revenues | -1 | 5 | 2 | 20 |
|---|
| Increase (Decrease) in Income Taxes Payable | -4 | -16 | 0 | 10 |
|---|
| Net cash provided by operating activities | 258 | 288 | 274 | 417 |
|---|
| Purchases of property and equipment and investment in capitalized software | 15 | 18 | 19 | 25 |
|---|
| Proceeds from sale of aircraft | - | - | 2 | - |
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| Acquisitions, net of cash acquired | 93 | 1,035 | 743 | 26 |
|---|
| Other investing activities | 8 | 4 | 11 | - |
|---|
| Purchases of investments | - | - | - | 12 |
|---|
| Net cash used in investing activities | -117 | -1,057 | -770 | -61 |
|---|
| Proceeds from investments | - | - | - | 2 |
|---|
| Net cash used in investing activities | -117 | -1,057 | -770 | -61 |
|---|
| Proceeds from credit facilities | 551 | 745 | 833 | 588 |
|---|
| Payments of credit facilities | 539 | 991 | 488 | 842 |
|---|
| Proceeds from Convertible Debt | - | 1,233 | - | - |
|---|
| Payments of debt issuance costs | 0 | 6 | - | - |
|---|
| Purchase of capped call options | - | 52 | - | - |
|---|
| Settlement of convertible senior notes | - | - | 2 | - |
|---|
| Proceeds from term loan | 125 | 200 | - | - |
|---|
| Repayments of term loan | 125 | - | 5 | 5 |
|---|
| Payments of acquisition debt and other consideration | 3 | 2 | 8 | - |
|---|
| Payments of contingent and non-contingent consideration | - | - | - | 4 |
|---|
| Follow-On Offering | 296 | - | - | - |
|---|
| Payments of dividends | 423 | 33 | 34 | 59 |
|---|
| Payments of Stock Issuance Costs | 1 | - | - | - |
|---|
| Proceeds from Stock Plans | - | 4 | 10 | 10 |
|---|
| Payments of dividends | 423 | 33 | 34 | 59 |
|---|
| Proceeds from exercise of stock options | 9 | 6 | 8 | 12 |
|---|
| Proceeds from Stock Plans | - | 4 | 10 | 10 |
|---|
| Payments for shares acquired including shares withheld for taxes | - | - | 44 | 59 |
|---|
| Proceeds from exercise of stock options | 9 | 6 | 8 | 12 |
|---|
| Repurchases of Class B common stock under approved program | 84 | 121 | 28 | - |
|---|
| Payments for shares acquired including shares withheld for taxes | - | - | 44 | 59 |
|---|
| Other | - | - | 1 | -0 |
|---|
| Repurchases of Class B common stock under approved program | 84 | 121 | 28 | - |
|---|
| Net cash (used in) provided by financing activities | -137 | 983 | 243 | -359 |
|---|
| Other | - | - | 1 | -0 |
|---|
| Net cash (used in) provided by financing activities | -137 | 983 | 243 | -359 |
|---|
| Effect of exchange rate changes on cash and cash equivalents | - | - | -5 | -0 |
|---|
| (Decrease) increase in cash and cash equivalents | 1 | 207 | -258 | -3 |
|---|
| Income Taxes Paid | 29 | 40 | 29 | 44 |
|---|
| Income tax refunds | 4 | 9 | 4 | 1 |
|---|
| Interest paid | - | 5 | 27 | 37 |
|---|
| Cost method investment | - | - | 6 | 4 |
|---|
| Shares issued related to acquisition | - | 182 | - | - |
|---|
| Contingent acquisition consideration | 2 | 5 | 1 | - |
|---|
| Deferred, non-contingent consideration, net | 1 | 10 | 1 | 1 |
|---|
| Term Loan Expenses Accrued In Period | - | 0 | - | - |
|---|
| Share-settled Bonus Plan awards | - | 21 | 22 | 17 |
|---|
| DCP elective participant deferrals | - | 3 | 7 | 2 |
|---|
| Net income | 127 | 93 | 175 | 327 |
|---|
| Depreciation and amortization | 36 | 53 | 72 | - |
|---|
| Depreciation, amortization, and impairment | - | - | - | 72 |
|---|
| Deferred income taxes | 16 | -20 | -5 | -199 |
|---|
| Stock-based compensation expense | 32 | 49 | 75 | 73 |
|---|
| Deferred compensation plan | - | - | -16 | 14 |
|---|
| Amortization of Debt Issuance Costs | 1 | 6 | 7 | - |
|---|
| Amortization And Write-Off Of Debt Issuance Costs | - | - | - | 7 |
|---|
| Change in fair value of derivative | 0 | 10 | 27 | -5 |
|---|
| Foreign currency remeasurement (gain) loss | 25 | -0 | -6 | 0 |
|---|
| Other | - | - | -3 | -21 |
|---|
| Accounts receivable | -12 | 36 | 61 | 5 |
|---|
| Prepaid and other assets | -12 | -14 | -14 | -4 |
|---|
| Accounts payable, accruals, and other liabilities | 48 | 50 | 29 | 69 |
|---|
| Deferred revenues | -1 | 5 | 2 | 20 |
|---|
| Increase (Decrease) in Income Taxes Payable | -4 | -16 | 0 | 10 |
|---|
| Net cash provided by operating activities | 258 | 288 | 274 | 417 |
|---|
| Purchases of property and equipment and investment in capitalized software | 15 | 18 | 19 | 25 |
|---|
| Proceeds from sale of aircraft | - | - | 2 | - |
|---|
| Acquisitions, net of cash acquired | 93 | 1,035 | 743 | 26 |
|---|
| Other investing activities | 8 | 4 | 11 | - |
|---|
| Purchases of investments | - | - | - | 12 |
|---|
| Net cash used in investing activities | -117 | -1,057 | -770 | -61 |
|---|
| Proceeds from investments | - | - | - | 2 |
|---|
| Net cash used in investing activities | -117 | -1,057 | -770 | -61 |
|---|
| Proceeds from credit facilities | 551 | 745 | 833 | 588 |
|---|
| Payments of credit facilities | 539 | 991 | 488 | 842 |
|---|
| Proceeds from Convertible Debt | - | 1,233 | - | - |
|---|
| Payments of debt issuance costs | 0 | 6 | - | - |
|---|
| Purchase of capped call options | - | 52 | - | - |
|---|
| Settlement of convertible senior notes | - | - | 2 | - |
|---|
| Proceeds from term loan | 125 | 200 | - | - |
|---|
| Repayments of term loan | 125 | - | 5 | 5 |
|---|
| Payments of acquisition debt and other consideration | 3 | 2 | 8 | - |
|---|
| Payments of contingent and non-contingent consideration | - | - | - | 4 |
|---|
| Follow-On Offering | 296 | - | - | - |
|---|
| Payments of dividends | 423 | 33 | 34 | 59 |
|---|
| Payments of Stock Issuance Costs | 1 | - | - | - |
|---|
| Proceeds from Stock Plans | - | 4 | 10 | 10 |
|---|
| Payments of dividends | 423 | 33 | 34 | 59 |
|---|
| Proceeds from exercise of stock options | 9 | 6 | 8 | 12 |
|---|
| Proceeds from Stock Plans | - | 4 | 10 | 10 |
|---|
| Payments for shares acquired including shares withheld for taxes | - | - | 44 | 59 |
|---|
| Proceeds from exercise of stock options | 9 | 6 | 8 | 12 |
|---|
| Repurchases of Class B common stock under approved program | 84 | 121 | 28 | - |
|---|
| Payments for shares acquired including shares withheld for taxes | - | - | 44 | 59 |
|---|
| Other | - | - | 1 | -0 |
|---|
| Repurchases of Class B common stock under approved program | 84 | 121 | 28 | - |
|---|
| Net cash (used in) provided by financing activities | -137 | 983 | 243 | -359 |
|---|
| Other | - | - | 1 | -0 |
|---|
| Net cash (used in) provided by financing activities | -137 | 983 | 243 | -359 |
|---|
| Effect of exchange rate changes on cash and cash equivalents | - | - | -5 | -0 |
|---|
| (Decrease) increase in cash and cash equivalents | 1 | 207 | -258 | -3 |
|---|
| Income Taxes Paid | 29 | 40 | 29 | 44 |
|---|
| Income tax refunds | 4 | 9 | 4 | 1 |
|---|
| Interest paid | - | 5 | 27 | 37 |
|---|
| Cost method investment | - | - | 6 | 4 |
|---|
| Shares issued related to acquisition | - | 182 | - | - |
|---|
| Contingent acquisition consideration | 2 | 5 | 1 | - |
|---|
| Deferred, non-contingent consideration, net | 1 | 10 | 1 | 1 |
|---|
| Term Loan Expenses Accrued In Period | - | 0 | - | - |
|---|
| Share-settled Bonus Plan awards | - | 21 | 22 | 17 |
|---|
| DCP elective participant deferrals | - | 3 | 7 | 2 |
|---|