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Income Taxes (Narrative) (Details)
$ in Millions
Mar. 31, 2017
USD ($)
Income Taxes [Abstract]  
Cumulative Effect of New Accounting Principle in Period of Adoption $ 4.7
Unrecognized tax benefits relating to UTPs 68.0
Unrecognized tax benefits, interest on income taxes accrued 8.3
Unrecognized tax benefits, income tax penalties accrued 6.0
Potential change in unrecognized tax benefits during next twelve months 14.0
Unrecognized tax benefits that would reduce the income tax provision $ 30.6