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Supplemental Balance Sheet Information - Property, Plant, and Equipment (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Property, Plant, and Equipment      
Total property, plant and equipment $ 1,707.0 $ 1,450.4  
Accumulated depreciation (572.4) (491.7)  
Net property, plant and equipment 1,134.6 958.7  
Accumulated depreciation (79.3) (67.4)  
Net finance lease assets 291.2 261.7  
Depreciation (includes finance leases) 104.9 89.2 $ 72.0
Land      
Property, Plant, and Equipment      
Total property, plant and equipment 178.6 160.1  
Total finance lease assets 113.5 96.1  
Buildings      
Property, Plant, and Equipment      
Total property, plant and equipment 1,045.8 869.5  
Total finance lease assets 169.8 165.6  
Technology hardware and software      
Property, Plant, and Equipment      
Total property, plant and equipment 147.1 117.1  
Machinery and equipment      
Property, Plant, and Equipment      
Total property, plant and equipment 262.8 231.6  
Total finance lease assets 7.9 0.0  
Construction in progress      
Property, Plant, and Equipment      
Total property, plant and equipment 72.7 72.1  
Assets held under capital and finance leases      
Property, Plant, and Equipment      
Total finance lease assets 291.2 261.7  
Accumulated depreciation (79.3) (67.4)  
Net finance lease assets $ 211.9 $ 194.3