Fair Value of Financial Instruments - Fair Value Hierarchy (Details) - USD ($) $ in Millions	Jun. 27, 2021	Dec. 27, 2020	Jun. 28, 2020
Assets:
Available-for-sale securities	$ 2.3	$ 2.1	$ 2.7
Derivatives	6.8	4.8	28.9
Total assets	9.1	6.9	31.6
Liabilities:
Derivatives	5.7	12.7	2.9
Option agreement	21.8	20.6	20.7
Total liabilities	27.5	33.3	23.6
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Available-for-sale securities	2.3	2.1	2.7
Derivatives	0.0	0.0	0.0
Total assets	2.3	2.1	2.7
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	6.8	4.8	28.9
Total assets	6.8	4.8	28.9
Liabilities:
Derivatives	5.7	12.7	2.9
Option agreement	0.0	0.0	0.0
Total liabilities	5.7	12.7	2.9
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	20.7
Total liabilities	$ 21.8	$ 20.6	$ 20.7