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Operating leases - Cost Components of Operating Leases (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Lessee, Lease, Description [Line Items]      
Operating lease cost $ 123.1 $ 117.6 $ 111.5
Variable lease cost 15.4 12.1 11.2
Short-term lease cost 32.6 23.7 26.6
Total 171.1 153.4 149.3
Leased Facilities and Equipment      
Lessee, Lease, Description [Line Items]      
Operating lease cost 101.1 99.4 96.8
Variable lease cost 14.0 10.5 9.7
Short-term lease cost 0.0 0.0 0.0
Total 115.1 109.9 106.5
Leased Vehicles      
Lessee, Lease, Description [Line Items]      
Operating lease cost 22.0 18.2 14.7
Variable lease cost 1.4 1.6 1.5
Short-term lease cost 32.6 23.7 26.6
Total $ 56.0 $ 43.5 $ 42.8