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Income Taxes - Components of Deferred Income Tax assets and Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Sep. 30, 2020
Deferred tax assets:    
Other long-term liabilities $ 57.3 $ 127.0
Losses and credits 61.5 34.8
Accrued warranty 16.3 15.8
Other current liabilities 24.5 17.7
Payroll-related obligations 26.2 18.5
Other 8.9 6.0
Gross deferred tax assets 194.7 219.8
Less valuation allowance (6.2) (17.4)
Deferred tax assets, net 188.5 202.4
Deferred tax liabilities:    
Intangible assets (51.6) (42.2)
Property, plant and equipment (143.9) (55.9)
Inventories (18.0) (18.6)
Other (40.6) (7.1)
Deferred tax liabilities (254.1) (123.8)
Net deferred tax liabilities (65.6)  
Net deferred tax assets $ 8.3 $ 78.6