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Income Taxes - Tax Benefits (Expense) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017
Income Tax Disclosure [Abstract]
Reversal of valuation allowances on deferred tax assets of certain foreign subsidiaries	$ 35.1	$ 28.7
Share-based compensation	10.4	15.8
Restructuring charges and various other items	6.5	9.9
Foreign withholding tax on certain undistributed foreign earnings	(22.0)	0.0
Income tax benefits (expense)	$ 30.0	$ 54.4

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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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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 repatriation of foreign earnings.

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