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Income Taxes - Tax Cuts and Jobs Act (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Income Tax Disclosure [Abstract] |  |
Tax Cuts And Jobs Act Of 2017, change in tax rate, provisional income tax expense |  | $ 136.7
Tax Cuts And Jobs Act Of 2017, provisional income tax expense (benefit) | $ 657.8 | 644.7
Tax Cuts And Jobs Act Of 2017, change in tax rate, deferred tax asset |  | 13.1
Tax Cuts And Jobs Act Of 2017, provisional income tax expense (benefit) | $ 0.06 |
Tax Cuts And Jobs Act Of 2017, effect of change on earnings per share, diluted (in usd per share) | $ 0.05 |
Tax Cuts And Jobs Act Of 2017, provisional amount recorded for valuation allowance release |  | $ 36.4

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