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Fair Value Measurements - Summary of Fair Value, by Balance Sheet Grouping (Details) - USD ($)
$ in Millions
Jul. 03, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying Amount $ 4,853.2 $ 3,749.2
Convertible notes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying Amount 1,184.7 1,163.1
Fair Value 1,479.2 1,730.2
Long-term debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying Amount 3,555.8 2,449.3
Fair Value $ 3,365.5 $ 2,427.8