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Income Taxes - Tax Benefits (Expense) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Reversal of valuation allowances on deferred tax assets of certain foreign subsidiaries	$ 36.4	$ 28.7
Share-based compensation	10.8	16.3
Restructuring charges and various other items	9.9	13.9
Redemption of 2023 Notes	0.0	7.5
Foreign withholding tax on certain undistributed foreign earnings	(22.0)	0.0
Tax rate change in a foreign subsidiary	7.2	2.0
Adjustment to 2017 provisional U.S. income tax expense	9.3	0.0
Income tax benefits (expense) related to discrete items	$ 51.6	$ 68.4

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