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Income Taxes (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]    
Unrecognized income tax benefits that would affect effective tax rate $ 165.3 $ 166.1
Accrued or deferred taxes relating to uncertain income tax positions 56.3 58.5
Accrued interest and penalties relating to unrecognized tax benefits $ 28.3 $ 27.2