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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2018 | Sep. 30, 2018 | Mar. 31, 2019
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Tax Cuts And Jobs Act of 2017, incomplete accounting, change in tax rate, deferred tax liability, provisional income tax (expense) benefit |  |  |  | $ 180.3 |  |
Tax Cuts And Jobs Act Of 2017, incomplete accounting, change in tax rate, deferred tax liability, provisional income tax benefit, including unrecognized deferred tax liability |  | $ 5.0 |  | 388.8 |  |
Tax Cuts And Jobs Act of 2017, provisional income tax expense (benefit) |  |  |  | (171.3) |  |
Tax Cuts And Jobs Act Of 2017, incomplete accounting, provisional income tax expense (benefit) |  | (5.3) |  |  |  |
Tax Cuts And Jobs Act of 2017, incomplete accounting, change in tax rate, deferred tax asset, provisional income tax expense (benefit) |  |  |  | 7.6 |  |
Tax Cuts And Jobs Act of 2017, incomplete accounting, transition tax for accumulated foreign earnings, provisional income tax expense (benefit) |  |  |  | 1.4 |  |
Effective income tax rate reconciliation, blended federal rate | (21.00%) |  | (24.50%) |  | (24.50%) |
Deferred income taxes |  | 905.9 |  | 905.9 | $ 991.9 | $ 970.8
Foreign Tax Authority | French Parliament | January 1, 2022 (Fiscal 2023) |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Income tax benefit, continuing operations, adjustment of deferred taxes |  | 3.7 | $ 17.3 |  |  |
Deferred income taxes |  | $ 13.6 |  | $ 13.6 |  |

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