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Property, plant and equipment (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Property, Plant and Equipment [Abstract]    
Property, plant and equipment, gross $ 1,031.2 $ 903.2
Accumulated depreciation (287.7) (259.1)
Total property, plant and equipment, net 743.5 644.1
Land and improvements    
Property, Plant and Equipment [Abstract]    
Property, plant and equipment, gross 51.7 52.7
Buildings, building improvements and leasehold improvements    
Property, Plant and Equipment [Abstract]    
Property, plant and equipment, gross 287.3 246.3
Furniture and equipment    
Property, Plant and Equipment [Abstract]    
Property, plant and equipment, gross 437.0 362.1
Software    
Property, Plant and Equipment [Abstract]    
Property, plant and equipment, gross 60.9 58.7
Construction-in-progress    
Property, Plant and Equipment [Abstract]    
Property, plant and equipment, gross $ 194.3 $ 183.4