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Property, Plant and Equipment - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Sep. 30, 2021
Property Plant And Equipment [Line Items]      
Depreciation expenses $ 21.7 $ 23.8  
Accelerated depreciation   $ 2.8  
Equipment on Operating Lease to Others      
Property Plant And Equipment [Line Items]      
Equipment on operating lease, net $ 8.9   $ 15.4
Equipment on Operating Lease to Others | Minimum      
Property Plant And Equipment [Line Items]      
Estimated useful life (in years) 5 years    
Equipment on Operating Lease to Others | Maximum      
Property Plant And Equipment [Line Items]      
Estimated useful life (in years) 10 years