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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Mar. 31, 2018
Income Tax Disclosure [Abstract] |  |
Interest on income taxes accrued | $ 31.4 | $ 12.9
Interest on income taxes accrued, acquisitions | 23.2 |
Income tax penalties accrued | 51.4 | 67.9
Tax Cuts and Jobs Act of 2017, provisional income tax benefit, remeasured deferred tax asset and liabilities |  | 136.7
Penalties on income taxes accrued, acquisitions | 15.8 |
Tax Cuts and Jobs Act of 2017, transition tax for accumulated foreign earnings | 657.8 | (644.7)
Tax Cuts and Jobs Act of 2017, transition tax for accumulated foreign earnings increase (decrease) | $ 13.1 |
Tax Cuts and Jobs Act of 2017, provisional income tax benefit, release of valuation allowance for foreign tax credits |  | $ 36.4

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