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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2016
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate |  |  |  |  | 21.00% |  |  | 24.50% |
Undistributed Earnings of Foreign Subsidiaries | $ 351.6 |  |  |  | $ 351.6 | $ 354.7 |  | $ 354.7 |
Foreign Earnings Repatriated |  |  |  |  | $ 13.0 |  |  |  |
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent | 0.10% | 0.20% |  |  | 0.10% |  | 0.40% |  |
Effective Income Tax Rate Reconciliation, Tax Settlement, State and Local, Amount | $ 0.7 |  |  |  | $ 0.7 |  |  |  |
Effective Income Tax Rate Reconciliation, Tax Settlement, State and Local, Percent | 3.00% |  |  |  |  |  | 0.80% |  |
Operating Loss Carryforwards | $ 9.4 |  |  |  | 9.4 |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, State and Local | 5.7 |  |  |  | 5.7 |  |  |  |
Deferred Tax Assets, Tax Credit Carryforwards, Foreign | 6.5 |  |  |  | 6.5 |  |  |  |
Deferred Tax Assets, Valuation Allowance | 3.5 |  |  |  | 3.5 |  |  |  | $ 3.6
Income Tax Expense (Benefit) | $ 5.3 | $ 8.9 |  |  | $ 19.0 |  | $ 41.2 |  |
Effective Income Tax Rate Reconciliation, Percent | 25.00% | 27.00% |  |  | 25.00% |  | 51.00% |  |
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount |  |  |  |  |  |  | $ 20.1 |  |
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent |  |  |  |  |  |  | 25.00% |  |
Deferred Income Tax Expense (Benefit) |  |  |  | $ 8.9 |  | $ 0.3 |  |  |
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount |  |  | $ 0.7 | $ 12.0 |  |  |  |  |

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