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Income Taxes - Tax Benefits (Expense) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Restructuring charges and various other items	$ 15.6	$ 4.1
Reversal of valuation allowances on deferred tax assets of a foreign subsidiary	0.0	35.1
Share-based compensation	3.2	10.1
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
Income tax benefits (expense) related to significant discrete items	$ 37.2	$ 27.3

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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