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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2020
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,
|  | 2020 |  | 2019 |  | 2018
Domestic |  | $ | 934.3 |  |  | $ | 854.1 |  |  | $ | 762.3 |
Foreign |  | 68.0 |  |  | 95.6 |  |  | 78.2 |
Total |  | $ | 1,002.3 |  |  | $ | 949.7 |  |  | $ | 840.5 |
Schedule of Components of Income Tax Expense (Benefit) | Components of Income tax expense (benefit) consist of the following:
|  | Year Ended December 31,
|  | 2020 |  | 2019 |  | 2018
Current: |  |  |  |  |  |
Federal |  | $ | 166.5 |  |  | $ | 224.7 |  |  | $ | 192.6 |
State |  | 49.2 |  |  | 56.1 |  |  | 43.3 |
Foreign |  | 18.3 |  |  | 20.0 |  |  | 17.7 |
Total current |  | 234.0 |  |  | 300.8 |  |  | 253.6 |
Deferred: |  |  |  |  |  |
Domestic |  | (18.8) |  |  | (83.0) |  |  | (52.7) |
Foreign |  | (1.4) |  |  | (4.9) |  |  | (3.4) |
Total deferred |  | (20.2) |  |  | (87.9) |  |  | (56.1) |
Income tax expense |  | $ | 213.8 |  |  | $ | 212.9 |  |  | $ | 197.5 |
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,
|  | 2020 |  | 2019 |  | 2018
Statutory federal income tax rate |  | $ | 210.5 |  |  | 21.0 | % |  | $ | 199.4 |  |  | 21.0 | % |  | $ | 176.5 |  |  | 21.0 | %
State taxes, net of federal effect |  | 36.0 |  |  | 3.6 |  |  | 35.4 |  |  | 3.7 |  |  | 31.1 |  |  | 3.7 |
Excess tax benefit of equity awards |  | (28.8) |  |  | (2.9) |  |  | (26.8) |  |  | (2.8) |  |  | (19.7) |  |  | (2.3) |
Effect of rates different than statutory |  | (0.8) |  |  | (0.1) |  |  | 0.8 |  |  | 0.1 |  |  | 0.6 |  |  | 0.1 |
Tax on foreign earnings |  | 1.0 |  |  | 0.1 |  |  | 2.1 |  |  | 0.2 |  |  | 2.8 |  |  | 0.3 |
Effect of tax law changes |  | (6.8) |  |  | (0.7) |  |  | — |  |  | — |  |  | (1.9) |  |  | (0.2) |
Other |  | 2.7 |  |  | 0.3 |  |  | 2.0 |  |  | 0.2 |  |  | 8.1 |  |  | 0.9 |
Effective tax rate |  | $ | 213.8 |  |  | 21.3 | % |  | $ | 212.9 |  |  | 22.4 | % |  | $ | 197.5 |  |  | 23.5 | %
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. Reclassifications have been made to conform to current year presentation.
|  | December 31,
|  | 2020 |  | 2019
Deferred tax assets: |  |  |  |
Contract liabilities |  | $ | 13.2 |  |  | $ | 46.3 |
Equity compensation plans |  | 20.1 |  |  | 21.1 |
Net operating loss and credit carryforwards, net |  | 22.9 |  |  | 20.1 |
Payroll and benefits |  | 21.8 |  |  | 9.6 |
Operating lease liabilities |  | 47.5 |  |  | 41.0 |
Accounts receivable |  | 26.0 |  |  | 15.6 |
Other |  | 15.9 |  |  | 14.1 |
Total deferred tax assets |  | 167.4 |  |  | 167.8 |
Deferred tax liabilities: |  |  |  |
Acquisition-related intangibles |  | 76.5 |  |  | 112.2 |
Property and equipment |  | 39.9 |  |  | 27.0 |
International investments |  | 19.2 |  |  | 19.2 |
Operating lease right-of-use assets |  | 32.5 |  |  | 33.7 |
Other |  | 23.3 |  |  | 17.5 |
Total deferred tax liabilities |  | 191.4 |  |  | 209.6 |
Deferred tax asset valuation allowance |  | 16.9 |  |  | 16.8 |
Net deferred tax liabilities |  | $ | 40.9 |  |  | $ | 58.6 |
Schedule of Unrecognized Tax Benefits Roll Forward | Changes in the Company's unrecognized tax benefits as of December 31, 2020, 2019 and 2018 were as follows:
|  | Year Ended December 31,
|  | 2020 |  | 2019 |  | 2018
Balance as of January 1 |  | $ | 17.7 |  |  | $ | 15.1 |  |  | $ | — |
Additions for tax positions related to current year |  | 0.1 |  |  | 2.6 |  |  | 15.1 |
Additions for tax positions related to prior year |  | 0.5 |  |  | — |  |  | — |
Balance as of December 31 |  | $ | 18.3 |  |  | $ | 17.7 |  |  | $ | 15.1 |

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