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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Mar. 31, 2019 | Mar. 31, 2018
Income Taxes [Abstract] |  |  |  |
Effective income tax rate | 18.20% | 13.40% |  |
Forecast [Member] |  |  |  |
Net of valuation allowance, classification [Abstract] |  |  |  |
Lapse of statute of limitations |  |  | $ (2.2) |
Unrecognized tax benefits that would impact effective tax rate |  |  | 1.6 |
Foreign Tax Reforms [Member] |  |  |  |
Net of valuation allowance, classification [Abstract] |  |  |  |
Valuation allowance - deferred tax assets | $ 33.7 |  |  |
Reversal of deferred tax asset valuation allowances | (2.0) |  |  |
Domestic Tax Jurisdiction [Member] |  |  |  |
Net of valuation allowance, classification [Abstract] |  |  |  |
Valuation allowance - deferred tax assets | $ 7.0 |  |  |
Research Tax Credit Carryforward [Member] |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Tax benefit from foreign development tax credit |  | $ 3.5 |  |
U.S Tax Reforms [Member] |  |  |  |
Effective income tax rate reconciliation [Abstract] |  |  |  |
Provisional discrete tax charges |  |  |  | $ 38.0
Deferred tax assets - change in amount |  |  |  | (19.0)
Transition tax charge |  |  |  | 19.0
Transition tax liability |  |  |  | $ 19.0
Term of estimated tax liability for transition tax | 8 years |  |  |
U.S Tax Reforms [Member] | Forecast [Member] |  |  |  |
Effective income tax rate reconciliation [Abstract] |  |  |  |
Estimated transition tax liability to be paid in the future |  |  | $ 1.5 |

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- Definition Amount of reasonable estimate for income tax expense (benefit) from effect of Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete. + References No definition available. + Details
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- Definition Amount of reasonable estimate for income tax expense from transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete. + References No definition available. + Details
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- Definition Amount of reasonable estimate for tax liability from transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete, classified as noncurrent. + References No definition available. + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign tax credit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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