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Fair Value Measurements - Summary of Carrying Amounts and Fair Values of Long-Term Borrowings (Details) - USD ($)
$ in Millions
Sep. 28, 2018
Dec. 31, 2017
Carrying Amount $ 2,900.1 $ 3,175.0
Convertible notes    
Carrying Amount 1,109.9 1,080.1
Fair Value 1,445.4 1,596.7
Long-term debt    
Carrying Amount 1,573.2 1,833.2
Fair Value $ 1,584.4 $ 1,845.4