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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Income Taxes |  |
Effective tax rate (as a percent) | 31.30% | 758.90%
Federal statutory rate (as a percent) | 21.00% | 21.00%
Income tax expense nondeductible Costs | $ 5.6 |
Tax expense related to Foreign residual income | 4.0 |
State income tax expense | 2.8 |
Income tax credits and incentives | 7.4 |
Valuation allowance on foreign tax credits |  | $ 38.1
Net benefit from Tax Cuts and Jobs Acts of 2017 |  | $ 38.1
Gross book-tax differences from non-U.S. subsidiaries | $ 1,700.0 |

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