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Business Segment Information - Schedule of Depreciation, Amortization and Capital Expenditure by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Dec. 31, 2023
Dec. 31, 2022
Sep. 30, 2021
Segment Reporting Information [Line Items]        
Depreciation and amortization $ 27.0 $ 159.9 $ 107.6 $ 104.0
Capital expenditures 43.2 329.9 279.7 114.8
Operating Segments | Access        
Segment Reporting Information [Line Items]        
Depreciation and amortization [1] 9.1 55.1 37.4 37.9
Capital expenditures [2] 17.2 112.3 65.7 55.8
Operating Segments | Defense        
Segment Reporting Information [Line Items]        
Depreciation and amortization 7.9 36.6 29.9 27.8
Capital expenditures 12.1 141.4 168.2 23.8
Operating Segments | Vocational        
Segment Reporting Information [Line Items]        
Depreciation and amortization 5.9 52.2 25.3 23.1
Capital expenditures 12.9 73.0 42.2 29.4
Corporate, Non-segment        
Segment Reporting Information [Line Items]        
Depreciation and amortization 4.1 16.0 15.0 15.2
Capital expenditures $ 1.0 $ 3.2 $ 3.6 $ 5.8
[1] Includes $3.6 million of accelerated depreciation associated with restructuring actions in fiscal 2021.
[2] Capital expenditures include both the purchase of property, plant and equipment and equipment held for rental.