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Income Taxes - Schedule of Effective Income Tax Reconciliation (Footnote) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Increase decrease in income tax expense as result of effectively connected income $ (28.5) $ (7.4) $ 7.3