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Intangible assets - Finite-Lived and Indefinite-Lived Intangible Assets (Details) - USD ($)
$ in Millions
Jun. 28, 2025
Dec. 28, 2024
Finite-Lived Intangible Assets    
Finite-lived, cost $ 2,249.4 $ 2,150.2
Finite-lived, accumulated amortization and impairment (1,486.1) (1,371.0)
Finite-lived, net 763.3 779.2
Indefinite-lived, cost 513.4 513.4
Indefinite-lived, accumulated amortization and impairment (44.0) (44.0)
Indefinite-lived, net 469.4 469.4
Cost 2,762.8 2,663.6
Accumulated amortization and impairment (1,530.1) (1,415.0)
Net 1,232.7 1,248.6
—Customer relationships    
Finite-Lived Intangible Assets    
Finite-lived, cost 1,996.5 1,921.5
Finite-lived, accumulated amortization and impairment (1,301.8) (1,194.7)
Finite-lived, net 694.7 726.8
—Technology    
Finite-Lived Intangible Assets    
Finite-lived, cost 90.9 90.5
Finite-lived, accumulated amortization and impairment (90.9) (90.5)
Finite-lived, net 0.0 0.0
—Capitalized software    
Finite-Lived Intangible Assets    
Finite-lived, cost 162.0 138.2
Finite-lived, accumulated amortization and impairment (93.4) (85.8)
Finite-lived, net $ 68.6 $ 52.4