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Income Taxes - Tax Benefits (Expense) (Details) - USD ($) $ in Millions | 6 Months Ended
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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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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32123-109318 + Details
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