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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred Tax Liabilities, Other | $ 0.2 |  |  |  | $ 0.4 |  |  |  | $ 0.2 | $ 0.4 |
Income tax expense | 6.9 | $ 5.3 | $ 7.5 | $ 6.2 | 4.8 | $ 8.9 | $ 6.8 | $ 25.5 | 25.9 | 46.0 | $ 8.8
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized (Gain) Loss Arising During Period, Tax |  |  |  |  |  |  |  |  | (0.2) | 0.1 | 1.0
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.1
Other Comprehensive Income (Loss), Tax |  |  |  |  |  |  |  |  | 25.7 | 46.1 | 9.9
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense |  |  |  |  |  |  |  |  | 0.0 |  |
Operating Loss Carryforwards | 7.1 |  |  |  | 9.4 |  |  |  | 7.1 | 9.4 |
Deferred Tax Assets, Operating Loss Carryforwards, Domestic | 1.1 |  |  |  | 0.0 |  |  |  | 1.1 | 0.0 | $ 21.9
Deferred Tax Assets, Net of Valuation Allowance, Operating Loss Carryforwards, State and Local | 5.6 |  |  |  |  |  |  |  | 5.6 |  |
Deferred Tax Assets, Valuation Allowance | 8.5 |  |  |  | 3.5 |  |  |  | 8.5 | 3.5 |
Valuation Allowance, Deferred Tax Asset, Change in Amount |  |  |  |  |  |  |  |  | 5.0 |  |
Undistributed Earnings of Foreign Subsidiaries | $ 383.5 |  |  |  | $ 354.7 |  |  |  | $ 383.5 | $ 354.7 |

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- Definition Deferred Tax Assets, Net of Valuation Allowance, Operating Loss Carryforwards, State and Local - Amount after allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards. + References No definition available. + Details
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- Definition Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109245112&loc=d3e23524-113945 + Details
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