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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2018 | Jun. 30, 2020 | Jun. 30, 2019
Income Taxes |  |  |  |  |
Effective tax rate (as a percent) |  |  |  | 14.20% | (2.00%)
Benefit related to release of valuation allowance on foreign tax credits |  |  |  |  | $ 38.1
Income tax credits and incentives |  |  |  | $ 22.9 | $ 18.2
Foreign residual income |  |  |  | 9.0 |
Tax expense from MS sale |  | $ 62.3 |  |  |
Goodwill impairment charge |  |  |  | $ 52.0 |
Federal statutory rate (as a percent) |  |  |  | 21.00% | 21.00%
Valuation allowance on foreign tax credits |  |  | $ 38.1 |  |
Gross book-tax differences from non-U.S. subsidiaries | $ 1,700.0 |  |  | $ 1,700.0 |
Tax benefit related to the release of a valuation allowance on net operating losses |  |  |  | 25.4 |
Valuation allowances | $ 25.4 |  |  |  |
Nondeductible costs |  |  |  | $ 21.7 | $ 12.1

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
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