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Income Taxes Income Taxes - Tax Reform (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Subsequent Event [Line Items] |  |  |  |
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount |  | $ 11.2 |  |
Undistributed Earnings of Foreign Subsidiaries |  | $ 354.7 |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate |  | 24.53% | 35.00% | 35.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  | $ 8.6 |  |
Scenario, Forecast [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Foreign Earnings Repatriated | $ 13.0 |  |  |

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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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