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Fair Value Measurements - Carrying Amounts and Fair Values of Financial Instruments (Details) - USD ($)
$ in Millions
Sep. 25, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Current portion of long-term debt, carrying amount $ 999.2 $ 1,500.0
Long-term debt, net of current maturities, carrying value 4,699.2 4,828.4
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Current portion of long-term debt, carrying amount 999.2 1,500.0
Current portion of long-term debt, fair value 1,008.5 1,500.0
Long-term debt, net of current maturities, carrying value 4,699.2 4,828.4
Long-term debt, net of current maturities, fair value $ 4,988.1 $ 4,992.3