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Impairment and restructuring charges - Schedule of Impairment of Long-Lived Assets Held and Used by Asset (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Sep. 30, 2023
Jun. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Impaired Long-Lived Assets Held and Used [Line Items]            
Impairment of long-lived assets $ 0.0 $ 27.2 $ 0.0 $ 306.7 $ 27.2 $ 306.7
Buildings, building improvements and leasehold improvements            
Impaired Long-Lived Assets Held and Used [Line Items]            
Impairment of long-lived assets         7.8 81.5
Furniture and equipment            
Impaired Long-Lived Assets Held and Used [Line Items]            
Impairment of long-lived assets         14.1 117.5
Software            
Impaired Long-Lived Assets Held and Used [Line Items]            
Impairment of long-lived assets         0.2 0.3
Construction-in-progress            
Impaired Long-Lived Assets Held and Used [Line Items]            
Impairment of long-lived assets         $ 5.1 $ 107.4