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Income Taxes (Details) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 USD ($) subsidiary | Jun. 30, 2016 | Jun. 30, 2017 USD ($) subsidiary | Jun. 30, 2016 | Sep. 30, 2016 USD ($)
Income Taxes |  |  |  |  |
Effective tax rate (as a percent) | 8.20% | (71.20%) | 0.50% | (18.60%) |
Federal statutory rate (as a percent) | 35.00% |  | 35.00% |  |
Benefit due to reinvesting portion of undistributed earnings | $ 21.2 |  | $ 21.2 |  |
Tax benefit related to non-controlling interests | 12.1 |  | 20.1 |  |
Favorable tax impact driven by changes in geographical mix | 7.1 |  | 14.5 |  |
Income tax credits and incentives | 6.8 |  | 14.2 |  |
Income tax expense nondeductible expenses | 6.9 |  | 13.1 |  |
Gross Book Tax Differences of Foreign Subsidiaries | 1,800.0 |  | 1,800.0 |  |
Undistributed earnings related to foreign subsidiaries | $ 92.0 |  | 92.0 |  | $ 113.2
United Kingdom |  |  |  |  |
Income Taxes |  |  |  |  |
Valuation allowances |  |  | $ 57.2 |  |
European |  |  |  |  |
Income Taxes |  |  |  |  |
Number of subsidiaries recapitalized | subsidiary | 1 |  | 1 |  |

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