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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

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