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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
Income Taxes - Additional Information [Line Items] |  |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  | 35.00% |  |  |  |  |
Provisional tax expense for the deemed repatriation of undistributed foreign earnings |  |  |  | $ 77.0 | $ 83.0 |  |  |  |
Estimated cash payment related to provisional tax expense for the deemed repatriation of undistributed foreign earnings | $ 6.4 |  |  |  | 6.4 |  |  |  |
Income Taxes Payable, long-current | 5.9 |  |  |  | $ 5.9 |  |  |  |
Provisional tax expense for the deemed repatriation of undistributed foreign earnings, Increase (decrease) | $ 6.0 |  |  |  |  |  |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  | $ 3.9 |  |  |  |  |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  | 2.9 |  |  |  |  |  |  |
Overstatement of deferred tax assets |  |  |  |  |  |  |  |  | $ 8.2
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent |  |  |  |  | 2.80% |  |  |  |
Income Tax (Textual) [Abstract] |  |  |  |  |  |  |  |  |
Effective tax rate | 31.20% |  | 19.00% |  | 27.50% | 45.90% |  |  |
Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |
Income Taxes - Additional Information [Line Items] |  |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  |  |  |  | 21.00% | 28.10% |
Income Tax Expense (Benefit) [Member] |  |  |  |  |  |  |  |  |
Income Taxes - Additional Information [Line Items] |  |  |  |  |  |  |  |  |
Quantifying Misstatement in Current Year Financial Statements, Amount |  | $ 5.3 |  |  |  |  |  |  |

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