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Income Taxes (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 15 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2019 | Mar. 31, 2019
Income Taxes [Abstract] |  |  |  |  |  |  |  |
Effective income tax rate |  | 482.20% |  | (58.30%) | 86.60% | 16.00% |  |
US Tax Reforms [Line Items] |  |  |  |  |  |  |  |
Provision (benefit) for income taxes |  | $ 35.2 |  | $ (0.7) | $ 37.4 | $ 1.3 |  |
Federal tax rate |  |  |  |  | 31.50% |  |  |
Valuation Allowance [Line Items] |  |  |  |  |  |  |  |
Unrecognized tax benefits reductions in fiscal 2018 |  |  | $ (1.8) |  |  |  |  |
Increase in deferred tax assets valuation allowance |  | 1.2 |  |  |  |  |  |
Forecast [Member] |  |  |  |  |  |  |  |
US Tax Reforms [Line Items] |  |  |  |  |  |  |  |
Federal tax rate |  |  |  |  |  |  | 21.00% |
Foreign Tax Reforms [Member] |  |  |  |  |  |  |  |
Valuation Allowance [Line Items] |  |  |  |  |  |  |  |
Deferred tax asset, valuation allowance |  | 47.4 |  |  | $ 47.4 |  |  |
Foreign Tax Reforms [Member] | Forecast [Member] |  |  |  |  |  |  |  |
Valuation Allowance [Line Items] |  |  |  |  |  |  |  |
Possible future release of valuation allowance against certain tax assets |  |  |  |  |  |  |  | $ 3.0
Domestic Tax Jurisdiction [Member] |  |  |  |  |  |  |  |
Valuation Allowance [Line Items] |  |  |  |  |  |  |  |
Deferred tax asset, valuation allowance |  | 7.0 |  |  | 7.0 |  |  |
Research Tax Credit Carryforward [Member] |  |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |
Tax benefit from foreign development tax credit |  | 2.2 |  |  | $ 7.9 |  |  |
U.S Tax Reforms [Member] |  |  |  |  |  |  |  |
US Tax Reforms [Line Items] |  |  |  |  |  |  |  |
Provision (benefit) for income taxes |  | 35.7 |  |  |  |  |  |
Federal tax rate |  |  |  |  | 35.00% |  |  |
Net reduction of deferred tax assets |  | (20.7) |  |  |  |  |  |
Income tax charge for transition tax |  | $ 15.0 |  |  |  |  |  |
Term of estimated tax liability for transition tax |  |  |  |  | 8 years |  |  |
U.S Tax Reforms [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
US Tax Reforms [Line Items] |  |  |  |  |  |  |  |
Federal tax rate | 21.00% |  |  |  |  |  |  |
U.S Tax Reforms [Member] | Forecast [Member] |  |  |  |  |  |  |  |
US Tax Reforms [Line Items] |  |  |  |  |  |  |  |
Estimated transition tax liability to be paid in the future |  |  |  |  |  |  | $ 1.0 |

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