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Income Taxes - Consolidated Provision for Income Taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current:      
Federal $ 52.2 $ 109.0 $ 103.4
State 28.6 18.9 22.9
Foreign 48.6 54.1 50.0
Total current 129.4 182.0 176.3
Deferred:      
Federal 51.3 (124.9) 62.3
State 13.2 10.4 10.0
Foreign (12.6) (9.1) (13.0)
Total deferred 51.9 (123.6) 59.3
Income tax expense $ 181.3 $ 58.4 $ 235.6