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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Sep. 30, 2018
Income Taxes |  |  |  |  |
Effective tax rate (as a percent) |  |  | 8.30% | (71.80%) |
Federal statutory rate (as a percent) |  |  | 21.00% | 24.50% | 35.00%
Valuation allowance on foreign tax credits | $ 38.1 |  | $ 38.1 |  |
Income tax credits and incentives |  |  | 19.3 | $ 21.6 |
Nondeductible costs |  |  | 14.6 |  |
Net benefit from Tax Cuts and Jobs Acts of 2017 |  |  |  | 41.7 |
Benefits from change in uncertain tax positions in US and Canada |  |  |  | 33.8 |
Goodwill impairment charge |  |  |  | $ 33.9 |
Amount of uncertain tax positions for future years |  | $ 26.2 |  |  |
Gross book-tax differences from non-U.S. subsidiaries |  |  | $ 1,800.0 |  |

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