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Property, plant and equipment, net - Schedule of Property, Plant, and Equipment (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Jun. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Property, Plant and Equipment [Abstract]            
Property, plant and equipment, gross $ 500.5     $ 500.5   $ 667.7
Less: Accumulated depreciation and amortization (290.7)     (290.7)   (397.1)
Total property, plant and equipment, net 209.8     209.8   270.6
Impairment of long-lived assets 0.0 $ 0.0 $ 27.2 0.0 $ 27.2 27.2
Land and improvements            
Property, Plant and Equipment [Abstract]            
Property, plant and equipment, gross 20.7     20.7   25.8
Buildings, building improvements and leasehold improvements            
Property, Plant and Equipment [Abstract]            
Property, plant and equipment, gross 159.4     159.4   196.1
Furniture and equipment            
Property, Plant and Equipment [Abstract]            
Property, plant and equipment, gross 252.9     252.9   368.3
Software            
Property, Plant and Equipment [Abstract]            
Property, plant and equipment, gross 62.2     62.2   67.2
Construction-in-progress            
Property, Plant and Equipment [Abstract]            
Property, plant and equipment, gross $ 5.3     $ 5.3   $ 10.3