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Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Sep. 25, 2021
Dec. 26, 2020
Sep. 26, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Unsecured Debt $ 1,000.0 $ 1,000.0 $ 910.0
Derivative, Fair Value, Net $ (0.8) $ (4.4) $ (7.9)