Financial Instruments - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Millions	Jun. 29, 2019		Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Balance sheet - cash and cash equivalents	$ 1,269.0	[1]	$ 1,493.2	$ 1,327.9
Restricted cash included in other current assets	15.5			21.2
Restricted cash included in other long-term assets	6.4			17.7
Statement of cash flows - cash, cash equivalents and restricted cash	$ 1,290.9		$ 1,519.8	$ 1,366.8	$ 1,500.4

[1] Unaudited.