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Financial Instruments - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Apr. 01, 2017
Fair Value Disclosures [Abstract]      
Balance sheet - cash and cash equivalents $ 1,268.5 [1] $ 1,500.4 $ 1,209.7
Restricted cash included in other current assets 8.4   0.0
Restricted cash included in other long-term assets 17.6   0.0
Statement of cash flows - cash, cash equivalents and restricted cash $ 1,294.5   $ 1,209.7
[1] Unaudited.