v3.26.3
Goodwill and intangible assets - Schedule of intangible assets (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Intangible Asset, Finite-Lived [Line Items]    
Accumulated amortization $ (849.6) $ (808.2)
Intangible Asset, Excluding Goodwill, after Accumulated Amortization [Abstract]    
Gross carrying amount 1,549.6 1,585.5
Accumulated amortization (849.6) (808.2)
Net 700.0 777.3
Trade names & trademarks (indefinite)    
Intangible Asset, Indefinite-Lived [Line Items]    
Trade names & trademarks (indefinite) 201.5 207.0
Customer relationships    
Intangible Asset, Finite-Lived [Line Items]    
Gross carrying amount 884.0 912.4
Accumulated amortization (496.8) (473.4)
Net 387.2 439.0
Intangible Asset, Excluding Goodwill, after Accumulated Amortization [Abstract]    
Accumulated amortization (496.8) (473.4)
Capitalized development costs    
Intangible Asset, Finite-Lived [Line Items]    
Gross carrying amount 463.3 465.3
Accumulated amortization (352.2) (334.2)
Net 111.1 131.1
Intangible Asset, Excluding Goodwill, after Accumulated Amortization [Abstract]    
Accumulated amortization (352.2) (334.2)
Developed technology    
Intangible Asset, Finite-Lived [Line Items]    
Gross carrying amount 0.8 0.8
Accumulated amortization (0.6) (0.6)
Net 0.2 0.2
Intangible Asset, Excluding Goodwill, after Accumulated Amortization [Abstract]    
Accumulated amortization $ (0.6) $ (0.6)