Debt (Schedule of Applicable Interest Rates on Variable-rate Debt) (Details) - USD ($) $ in Millions	Mar. 26, 2021	Dec. 25, 2020
Schedule of Applicable Interest Rate on Variable-rate Debt [Line Items]
Secured Debt	$ 3,503.7	$ 3,622.6
2017 Revolving Credit Facility
Schedule of Applicable Interest Rate on Variable-rate Debt [Line Items]
Interest rate	4.47%
Secured Debt	$ 900.0	900.0
Term Loan due 2025
Schedule of Applicable Interest Rate on Variable-rate Debt [Line Items]
Secured Debt	$ 374.6	399.5
Term Loan due 2025 | Secured Debt
Schedule of Applicable Interest Rate on Variable-rate Debt [Line Items]
Long-term Debt, Weighted Average Interest Rate, at Point in Time	6.25%
Term Loan due 2024
Schedule of Applicable Interest Rate on Variable-rate Debt [Line Items]
Secured Debt	$ 1,411.2	$ 1,505.2
Term Loan due 2024 | Secured Debt
Schedule of Applicable Interest Rate on Variable-rate Debt [Line Items]
Long-term Debt, Weighted Average Interest Rate, at Point in Time	6.00%