Fair Value of Financial Instruments - Fair Value Hierarchy (Details) - USD ($) $ in Millions	Sep. 26, 2021	Dec. 27, 2020	Sep. 27, 2020
Assets:
Available-for-sale securities	$ 2.0	$ 2.1	$ 3.7
Derivatives	9.8	4.8	15.7
Total assets	11.8	6.9	19.4
Liabilities:
Derivatives	1.7	12.7	0.4
Option agreement	21.8	20.6	20.6
Total liabilities	23.5	33.3	21.0
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Available-for-sale securities	2.0	2.1	3.7
Derivatives	0.0	0.0	0.0
Total assets	2.0	2.1	3.7
Liabilities:
Derivatives	0.0	0.0	0.0
Option agreement	0.0	0.0	0.0
Total liabilities	0.0	0.0	0.0
Significant Other Observable Inputs (Level 2)
Assets:
Available-for-sale securities	0.0	0.0	0.0
Derivatives	9.8	4.8	15.7
Total assets	9.8	4.8	15.7
Liabilities:
Derivatives	1.7	12.7	0.4
Option agreement	0.0	0.0	0.0
Total liabilities	1.7	12.7	0.4
Significant Unobservable Inputs (Level 3)
Assets:
Available-for-sale securities	0.0	0.0	0.0
Derivatives	0.0	0.0	0.0
Total assets	0.0	0.0	0.0
Liabilities:
Derivatives	0.0	0.0	0.0
Option agreement	21.8	20.6	20.6
Total liabilities	$ 21.8	$ 20.6	$ 20.6