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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2018
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,
(in millions) |  | 2018 |  | 2017 |  | 2016
|  |  |  | (as adjusted) |  | (as adjusted)
Domestic |  | $ | 762.3 |  |  | $ | 608.3 |  |  | $ | 635.5 |
Foreign |  | 78.2 |  |  | 52.4 |  |  | 37.7 |
Total |  | $ | 840.5 |  |  | $ | 660.7 |  |  | $ | 673.2 |
Schedule of Components of Income Tax Expense (Benefit) | Components of Income tax expense (benefit) consist of the following:
|  | Year Ended December 31,
(in millions) |  | 2018 |  | 2017 |  | 2016
|  |  |  | (as adjusted) |  | (as adjusted)
Current: |  |  |  |  |  |
Federal |  | $ | 192.6 |  |  | $ | 258.9 |  |  | $ | 295.6 |
State |  | 43.3 |  |  | 29.8 |  |  | 34.9 |
Foreign |  | 17.7 |  |  | 21.3 |  |  | 16.8 |
Total current |  | 253.6 |  |  | 310.0 |  |  | 347.3 |
Deferred: |  |  |  |  |  |
Domestic |  | (52.7 | ) |  | (167.6 | ) |  | (90.5 | )
Foreign |  | (3.4 | ) |  | (4.8 | ) |  | (8.7 | )
Total deferred |  | (56.1 | ) |  | (172.4 | ) |  | (99.2 | )
Income tax expense |  | $ | 197.5 |  |  | $ | 137.6 |  |  | $ | 248.1 |
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 is as follows:
|  | Year Ended December 31,
(dollars in millions) |  | 2018 |  | 2017 |  | 2016
|  |  |  |  |  | (as adjusted) |  | (as adjusted)
Statutory federal income tax rate |  | $ | 176.5 |  |  | 21.0 | % |  | $ | 231.1 |  |  | 35.0 | % |  | $ | 235.5 |  |  | 35.0 | %
State taxes, net of federal effect |  | 31.1 |  |  | 3.7 |  |  | 18.3 |  |  | 2.8 |  |  | 17.7 |  |  | 2.6 |
Excess tax benefit of equity awards |  | (19.7 | ) |  | (2.3 | ) |  | (36.2 | ) |  | (5.5 | ) |  | (1.6 | ) |  | (0.2 | )
Effect of rates different than statutory |  | 0.6 |  |  | 0.1 |  |  | (6.3 | ) |  | (1.0 | ) |  | (4.6 | ) |  | (0.7 | )
Tax on foreign earnings |  | 2.8 |  |  | 0.3 |  |  | 1.0 |  |  | 0.1 |  |  | 0.8 |  |  | 0.1 |
Effect of UK tax rate change on deferred taxes |  | — |  |  | — |  |  | — |  |  | — |  |  | (1.5 | ) |  | (0.2 | )
Effect of US Tax Cuts and Jobs Act on deferred taxes and repatriation tax |  | (1.9 | ) |  | (0.2 | ) |  | (75.5 | ) |  | (11.4 | ) |  | — |  |  | — |
Other |  | 8.1 |  |  | 0.9 |  |  | 5.2 |  |  | 0.8 |  |  | 1.8 |  |  | 0.3 |
Effective tax rate |  | $ | 197.5 |  |  | 23.5 | % |  | $ | 137.6 |  |  | 20.8 | % |  | $ | 248.1 |  |  | 36.9 | %
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,
(in millions) |  | 2018 |  | 2017
Deferred tax assets: |  |  |  |
Equity compensation plans |  | $ | 17.7 |  |  | $ | 18.7 |
Payroll and benefits |  | 9.3 |  |  | 8.0 |
Deferred interest |  | — |  |  | 6.8 |
Net operating loss and credit carryforwards, net |  | 23.8 |  |  | 28.1 |
Rent |  | 7.5 |  |  | 7.4 |
Accounts receivable |  | 6.5 |  |  | 5.4 |
Other |  | 10.0 |  |  | 9.5 |
Total deferred tax assets |  | 74.8 |  |  | 83.9 |
Deferred tax liabilities: |  |  |  |
Software and intangibles |  | 148.6 |  |  | 194.5 |
Deferred income |  | — |  |  | 18.6 |
International investments |  | 19.2 |  |  | 19.2 |
Property and equipment |  | 20.0 |  |  | 20.4 |
Other |  | 11.7 |  |  | 12.0 |
Total deferred tax liabilities |  | 199.5 |  |  | 264.7 |
Deferred tax asset valuation allowance |  | 17.2 |  |  | 15.5 |
Net deferred tax liabilities |  | $ | 141.9 |  |  | $ | 196.3 |
Schedule of Unrecognized Tax Benefits Roll Forward | Changes in the Company's unrecognized tax benefits at December 31, 2018, 2017 and 2016 were as follows:
|  | Year Ended December 31,
(in millions) |  | 2018 |  | 2017 |  | 2016
Balance as of January 1, 2018 |  | $ | — |  |  | $ | — |  |  | $ | — |
Additions for tax positions related to current year |  | 15.1 |  |  | — |  |  | — |
Balance as of December 31, 2018 |  | $ | 15.1 |  |  | $ | — |  |  | $ | — |

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