Intangible assets - Finite-Lived and Indefinite-Lived Intangible Assets (Details) - USD ($) $ in Millions	Jun. 29, 2024	Dec. 30, 2023
Finite-Lived Intangible Assets
Finite-lived, cost	$ 2,172.4	$ 2,211.5
Finite-lived, accumulated amortization and impairment	(1,332.4)	(1,294.8)
Finite-lived, net	840.0	916.7
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	2,685.8	2,724.9
Accumulated amortization and impairment	(1,376.4)	(1,338.8)
Net	1,309.4	1,386.1
—Customer relationships
Finite-Lived Intangible Assets
Finite-lived, cost	1,958.3	2,003.6
Finite-lived, accumulated amortization and impairment	(1,160.5)	(1,127.7)
Finite-lived, net	797.8	875.9
—Technology
Finite-Lived Intangible Assets
Finite-lived, cost	90.5	90.6
Finite-lived, accumulated amortization and impairment	(90.5)	(90.3)
Finite-lived, net	0.0	0.3
—Capitalized software
Finite-Lived Intangible Assets
Finite-lived, cost	123.6	117.3
Finite-lived, accumulated amortization and impairment	(81.4)	(76.8)
Finite-lived, net	$ 42.2	$ 40.5

Indefinite-Lived Intangible Assets (Excluding Goodwill), Gross

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Indefinite-Lived Intangible Assets (Excluding Goodwill), Impaired, Accumulated Impairment Loss

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Intangible Assets (Excluding Goodwill), Accumulated Amortization and Impairment Loss

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before accumulated amortization of intangible assets, excluding goodwill.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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