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Income Taxes - Income Tax Expense by Component (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 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

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