The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Goodwill and Other Intangible Assets - Narrative and Estimated Amortization Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 27, 2020	Dec. 29, 2019	Dec. 30, 2018
Indefinite-lived Intangible Assets [Line Items]
Weighted-average remaining useful life	3 years 4 months 24 days
Amortization expense for intangible assets	$ 38.1	$ 44.3	$ 43.6
Fiscal year 2021	36.2
Fiscal year 2022	29.6
Fiscal year 2023	18.0
Fiscal year 2024	4.5
Fiscal year 2025	1.5
Thereafter	4.8
Total	$ 94.6
Customer relationships
Indefinite-lived Intangible Assets [Line Items]
Weighted-average remaining useful life	4 years 7 months 6 days
Tradenames
Indefinite-lived Intangible Assets [Line Items]
Weighted-average remaining useful life	13 years 10 months 24 days
Computer software & technology
Indefinite-lived Intangible Assets [Line Items]
Weighted-average remaining useful life	2 years 3 months 18 days
Tradenames
Indefinite-lived Intangible Assets [Line Items]
Carrying amount of tradenames	$ 56.0	$ 56.0