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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2016
Sep. 30, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Unrecognized income tax benefits that would affect effective tax rate   $ 147.7 $ 133.0
Accrued or deferred taxes relating to uncertain income tax positions   54.8 61.2
Accrued interest and penalties relating to unrecognized tax benefits   $ 19.2 $ 18.3
Noncash deferred income tax charge $ 31.6