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Income Taxes Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 28, 2018 | Sep. 29, 2017 | Sep. 28, 2018 | Sep. 29, 2017 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |
Effective income tax rate (as a percent) | 22.60% |  | 18.10% |  |
U.S. federal statutory rate (as a percent) | 21.00% | 35.00% | 21.00% | 35.00% |
Provisional tax benefit |  |  |  |  | $ 449.9
Unrecognized tax benefits, income tax penalties and interest accrued | $ 5.1 | $ 5.3 | $ 5.1 | $ 5.3 |
Possible reduction in unrecognized tax benefits in next twelve months | $ 2.9 |  | $ 2.9 |  |

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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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