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Property, plant and equipment, net - Summary of Property, Plant and Equipment Useful Lives (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Property, Plant and Equipment [Line Items]          
Property, plant and equipment, gross     $ 667.7 $ 794.2  
Less: Accumulated depreciation and amortization     (397.1) (411.4)  
Total property, plant and equipment, net     270.6 382.8  
Impairment of long-lived assets $ 27.2 $ 306.7 27.2 306.7 $ 0.0
Land and improvements          
Property, Plant and Equipment [Line Items]          
Property, plant and equipment, gross     25.8 30.0  
Buildings, building improvements and leasehold improvements          
Property, Plant and Equipment [Line Items]          
Property, plant and equipment, gross     196.1 229.9  
Furniture and equipment          
Property, Plant and Equipment [Line Items]          
Property, plant and equipment, gross     368.3 433.6  
Software          
Property, Plant and Equipment [Line Items]          
Property, plant and equipment, gross     67.2 64.0  
Construction-in-progress          
Property, Plant and Equipment [Line Items]          
Property, plant and equipment, gross     $ 10.3 $ 36.7