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 |