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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2023
Income Tax Disclosure [Abstract] |
Schedule of Income before Income Tax, Domestic and Foreign | Income before income taxes was taxed under the following jurisdictions:
|  | Year Ended December 31,
|  | 2023 |  | 2022 |  | 2021
Domestic |  | $ | 1,298.1 |  |  | $ | 1,355.6 |  |  | $ | 1,186.7 |
Foreign |  | 152.1 |  |  | 132.2 |  |  | 111.1 |
Total |  | $ | 1,450.2 |  |  | $ | 1,487.8 |  |  | $ | 1,297.8 |
Schedule of Components of Income Tax Expense (Benefit) | Components of Income tax expense (benefit) consist of the following:
|  | Year Ended December 31,
|  | 2023 |  | 2022 |  | 2021
Current: |  |  |  |  |  |
Federal |  | $ | 267.3 |  |  | $ | 281.8 |  |  | $ | 235.6 |
State |  | 69.7 |  |  | 75.8 |  |  | 52.9 |
Foreign |  | 41.6 |  |  | 33.9 |  |  | 27.4 |
Total current |  | 378.6 |  |  | 391.5 |  |  | 315.9 |
Deferred: |  |  |  |  |  |
Domestic |  | (29.3) |  |  | (15.0) |  |  | (8.7) |
Foreign |  | (3.4) |  |  | (3.2) |  |  | 2.0 |
Total deferred |  | (32.7) |  |  | (18.2) |  |  | (6.7) |
Income tax expense |  | $ | 345.9 |  |  | $ | 373.3 |  |  | $ | 309.2 |
Schedule of Effective Income Tax Rate Reconciliation | The reconciliation between the statutory tax rate expressed as a percentage of income before income taxes and the effective tax rate was as follows:
|  | Year Ended December 31,
|  | 2023 |  | 2022 |  | 2021
Statutory federal income tax rate |  | $ | 304.5 |  |  | 21.0 | % |  | $ | 312.4 |  |  | 21.0 | % |  | $ | 272.5 |  |  | 21.0 | %
State taxes, net of federal effect |  | 55.8 |  |  | 3.8 |  |  | 61.1 |  |  | 4.1 |  |  | 50.3 |  |  | 3.9 |
Excess tax benefit of equity awards |  | (29.6) |  |  | (2.0) |  |  | (12.0) |  |  | (0.8) |  |  | (30.1) |  |  | (2.3) |
Tax on foreign earnings |  | 8.5 |  |  | 0.6 |  |  | 3.0 |  |  | 0.2 |  |  | 1.7 |  |  | 0.1 |
Effect of tax law changes |  | — |  |  | — |  |  | — |  |  | — |  |  | 4.8 |  |  | 0.4 |
Other |  | 6.7 |  |  | 0.5 |  |  | 8.8 |  |  | 0.6 |  |  | 10.0 |  |  | 0.7 |
Effective tax rate |  | $ | 345.9 |  |  | 23.9 | % |  | $ | 373.3 |  |  | 25.1 | % |  | $ | 309.2 |  |  | 23.8 | %
Schedule of Deferred Tax Assets and Liabilities | The tax effect of temporary differences that give rise to net deferred income tax liabilities is presented below.
|  | December 31,
|  | 2023 |  | 2022
Deferred tax assets: |  |  |  |
Contract liabilities |  | $ | 38.4 |  |  | $ | 46.3 |
Equity compensation plans |  | 34.5 |  |  | 31.3 |
Net operating loss and credit carryforwards, net |  | 17.0 |  |  | 17.0 |
Payroll and benefits |  | 17.2 |  |  | 24.3 |
Operating lease liabilities |  | 45.6 |  |  | 48.5 |
Accounts receivable |  | 20.1 |  |  | 18.1 |
Other |  | 19.9 |  |  | 19.5 |
Total deferred tax assets |  | 192.7 |  |  | 205.0 |
Deferred tax liabilities: |  |  |  |
Acquisition-related intangibles |  | 269.8 |  |  | 293.3 |
Property and equipment |  | 22.4 |  |  | 38.1 |
Operating lease right-of-use assets |  | 27.6 |  |  | 32.9 |
Other |  | 26.7 |  |  | 27.1 |
Total deferred tax liabilities |  | 346.5 |  |  | 391.4 |
Deferred tax asset valuation allowance |  | 17.0 |  |  | 17.0 |
Net deferred tax liabilities |  | $ | 170.8 |  |  | $ | 203.4 |
Schedule of Unrecognized Tax Benefits Roll Forward | Changes in the Company’s unrecognized tax benefits as of December 31, 2023, 2022 and 2021 were as follows:
|  | Year Ended December 31,
|  | 2023 |  | 2022 |  | 2021
Balance as of January 1 |  | $ | 18.7 |  |  | $ | 18.4 |  |  | $ | 18.3 |
Additions for current year and prior year |  | 0.6 |  |  | 0.3 |  |  | 0.1 |
Balance as of December 31 |  | $ | 19.3 |  |  | $ | 18.7 |  |  | $ | 18.4 |

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