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Income Taxes - Tax Benefits (Expense) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018
Income Tax Disclosure [Abstract]
Restructuring charges and various other items	$ 35.7	$ 9.9
Valuation allowances on deferred tax assets of a foreign subsidiary	(10.4)	36.4
Share-based compensation	3.1	10.8
Increase in foreign withholding tax on certain undistributed foreign earnings	0.0	(22.0)
Change in tax status of certain affiliates	18.4	0.0
Tax rate change in foreign subsidiary	0.0	7.2
Research and development tax credits	28.6	0.0
Adjustment to 2017 provisional U.S. income tax expense	0.0	9.3
Income tax benefits (expense) related to significant discrete items	$ 75.4	$ 51.6

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