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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Mar. 31, 2018
Income Tax Disclosure [Abstract]          
Net gain related to value of deferred tax liabilities         $ 267.0
Net gain related to lower blended rate         3.2
Net gain         270.2
Tax Cuts and Jobs Act of 2017, incomplete accounting, transition tax for foreign earnings, provisional income tax expense         1.9
Effective income tax rate (percent) 25.20% (446.10%) 26.60% (137.60%)  
Uncertain tax liability $ 9.8   $ 9.8   $ 10.8