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Income Taxes - Income Tax Provision (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current      
Federal $ 211.7 $ 35.6 $ (8.4)
State 8.4 4.0 0.0
Non-United States 168.6 144.0 158.7
Total current 388.7 183.6 150.3
Deferred      
Federal (178.2) 69.7 92.9
State (0.8) 0.5 1.8
Non-United States (17.8) 3.8 (3.5)
Total deferred (196.8) 74.0 91.2
Total provision $ 191.9 $ 257.6 $ 241.5