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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2016 | Mar. 31, 2015
Income Taxes |  |  |  |
Effective tax rate (as a percent) | 15.50% | 137.30% | 14.80% | 47.40%
Federal statutory rate (as a percent) | 35.00% |  | 35.00% |
Effective tax rate reconciliation impact of non-deductible research and development expenses | $ 5.9 |  | $ 12.3 |
Tax benefit related to non-controlling interests | 8.5 |  | 8.4 |
Valuation allowances adjustments related to non deductible research and development credits | 3.9 |  | 3.9 |
Discrete expense, net of related valuation allowance |  |  | 3.8 |
Undistributed earnings related to foreign subsidiaries | $ 97.3 |  | $ 97.3 |

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