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Income Taxes (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]    
Unrecognized income tax benefits that would affect effective tax rate $ 160.1 $ 163.4
Accrued or deferred taxes relating to uncertain income tax positions 56.8 61.8
Accrued interest and penalties relating to unrecognized tax benefits $ 25.2 $ 23.0