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Unaudited Quarterly Results - Schedule of Unaudited Quarterly Results (Parenthetical) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2018 | Sep. 30, 2020 | Sep. 30, 2018
Effect Of Fourth Quarter Events [Line Items] |  |  |  |  |  |
Restructuring charges | $ 13.0 | $ 10.2 |  |  | $ 14.4 |
Restructuring charge, net of tax | 9.5 | $ 8.4 |  |  |  |
Gain (loss) on extinguishment of debt |  |  | $ (8.5) |  |  |
Extinguishment of Debt, Gain (Loss), Net of Tax |  |  | (6.5) |  |  |
Tax Cuts and Jobs Act, Income Tax Expense (Benefit) |  |  |  | $ 7.0 |  |
Europe |  |  |  |  |  |
Effect Of Fourth Quarter Events [Line Items] |  |  |  |  |  |
Valuation allowance on foreign net deferred tax assets |  |  | $ 11.4 |  |  |
Defense |  |  |  |  |  |
Effect Of Fourth Quarter Events [Line Items] |  |  |  |  |  |
Former Gain Contingency, Recognized in Current Period | 4.2 |  |  |  | 4.2 | $ 19.0
Gain Contingency, Net of Tax | 3.2 |  |  |  | 3.2 |
Commercial |  |  |  |  |  |
Effect Of Fourth Quarter Events [Line Items] |  |  |  |  |  |
Restructuring charges |  |  |  |  | 1.5 | 5.4
Former Gain Contingency, Recognized in Current Period | 1.5 |  |  |  | 1.5 |
Gain on Business Interruption Insurance Recovery | 18.5 |  |  |  | 18.5 | 6.6
Gain on Business Interruption Insurance Recovery, Net of Tax | 14.2 |  |  |  |  |
Gain (Loss) on Disposition of Business | 3.1 |  |  |  | $ 3.1 | $ (1.4)
Gain (Loss) on Disposition of Business, Net of Tax | $ 2.8 |  |  |  |  |

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