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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 6 Months Ended 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Impaired Long-Lived Assets Held and Used [Line Items]          
Impairment of long-lived assets $ 0.0 $ 27.2 $ 0.0 $ 27.2 $ 27.2
Buildings, building improvements and leasehold improvements          
Impaired Long-Lived Assets Held and Used [Line Items]          
Impairment of long-lived assets   7.8      
Furniture and equipment          
Impaired Long-Lived Assets Held and Used [Line Items]          
Impairment of long-lived assets   14.1      
Software          
Impaired Long-Lived Assets Held and Used [Line Items]          
Impairment of long-lived assets   0.2      
Construction-in-progress          
Impaired Long-Lived Assets Held and Used [Line Items]          
Impairment of long-lived assets   $ 5.1