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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2017
Income Tax Disclosure [Abstract] |
Schedule of Income before Income Tax, Domestic and Foreign | Income before income taxes was taxed under the following jurisdictions:
|  | Years Ended December 31,
(in millions) |  | 2017 |  | 2016 |  | 2015
Domestic |  | $ | 607.1 |  |  | $ | 635.5 |  |  | $ | 626.4 |
Foreign |  | 53.2 |  |  | 36.9 |  |  | 20.6 |
Total |  | $ | 660.3 |  |  | $ | 672.4 |  |  | $ | 647.0 |
Schedule of Components of Income Tax Expense (Benefit) | Components of Income tax expense (benefit) consist of the following:
|  | Years Ended December 31,
(in millions) |  | 2017 |  | 2016 |  | 2015
Current: |  |  |  |  |  |
Federal |  | $ | 258.9 |  |  | $ | 295.7 |  |  | $ | 258.5 |
State |  | 29.8 |  |  | 34.9 |  |  | 28.6 |
Foreign |  | 21.3 |  |  | 16.8 |  |  | 10.1 |
Total current |  | 310.0 |  |  | 347.4 |  |  | 297.2 |
Deferred: |  |  |  |  |  |
Domestic |  | (168.0 | ) |  | (90.5 | ) |  | (48.5 | )
Foreign |  | (4.7 | ) |  | (8.9 | ) |  | (4.8 | )
Total deferred |  | (172.7 | ) |  | (99.4 | ) |  | (53.3 | )
Income tax expense |  | $ | 137.3 |  |  | $ | 248.0 |  |  | $ | 243.9 |
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:
|  | Years Ended December 31,
(dollars in millions) |  | 2017 |  | 2016 |  | 2015
Statutory federal income tax rate |  | $ | 231.1 |  |  | 35.0 | % |  | $ | 235.4 |  |  | 35.0 | % |  | $ | 226.4 |  |  | 35.0 | %
State taxes, net of federal effect(1) |  | 18.3 |  |  | 2.8 |  |  | 17.8 |  |  | 2.6 |  |  | 16.5 |  |  | 2.6 |
Excess tax benefit of equity awards |  | (36.2 | ) |  | (5.5 | ) |  | (1.6 | ) |  | (0.2 | ) |  | — |  |  | — |
Effect of rates different than statutory |  | (6.3 | ) |  | (1.0 | ) |  | (4.5 | ) |  | (0.7 | ) |  | (1.9 | ) |  | (0.3 | )
Foreign withholding tax |  | 1.0 |  |  | 0.2 |  |  | 0.8 |  |  | 0.1 |  |  | 3.3 |  |  | 0.5 |
Effect of UK tax rate change on deferred taxes |  | — |  |  | — |  |  | (1.5 | ) |  | (0.2 | ) |  | (4.0 | ) |  | (0.6 | )
Effect of US Tax Cuts and Jobs Act on Deferred Taxes and Mandatory Repatriation Tax |  | (75.5 | ) |  | (11.4 | ) |  | — |  |  | — |  |  | — |  |  | — |
Other |  | 4.9 |  |  | 0.7 |  |  | 1.6 |  |  | 0.3 |  |  | 3.6 |  |  | 0.5 |
Effective tax rate |  | $ | 137.3 |  |  | 20.8 | % |  | $ | 248.0 |  |  | 36.9 | % |  | $ | 243.9 |  |  | 37.7 | %
(1) | The impact of state taxes on excess tax benefits of equity awards and the US Tax Cuts and Jobs Act are presented on the respective separate lines in the effective tax rate reconciliation.
Schedule of Deferred Tax Assets and Liabilities | The tax effect of temporary differences that give rise to the net deferred income tax liabilities is presented below:
|  | December 31,
(in millions) |  | 2017 |  | 2016
Deferred tax assets: |  |  |  |
Equity compensation plans |  | $ | 18.7 |  |  | $ | 29.2 |
Payroll and benefits |  | 8.0 |  |  | 22.7 |
Deferred interest |  | 6.8 |  |  | 13.9 |
Net operating loss and credit carryforwards, net |  | 28.1 |  |  | 12.7 |
Rent |  | 7.4 |  |  | 11.0 |
Accounts receivable |  | 5.4 |  |  | 8.3 |
Other |  | 8.0 |  |  | 6.2 |
Trade credits |  | 1.5 |  |  | 0.6 |
Total deferred tax assets |  | 83.9 |  |  | 104.6 |
Deferred tax liabilities: |  |  |  |
Software and intangibles |  | 194.5 |  |  | 337.4 |
Deferred income |  | 18.6 |  |  | 58.3 |
International investments |  | 19.2 |  |  | 31.3 |
Property and equipment |  | 20.4 |  |  | 30.3 |
Other |  | 12.0 |  |  | 15.3 |
Total deferred tax liabilities |  | 264.7 |  |  | 472.6 |
Deferred tax asset valuation allowance |  | 15.5 |  |  | 1.2 |
Net deferred tax liabilities |  | $ | 196.3 |  |  | $ | 369.2 |

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