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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 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) | 29.10% | 37.70% | 27.40% | 36.80% |
Uncertain tax liability | $ 10.8 |  | $ 10.8 |  | $ 10.8

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