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Summary of Significant Accounting Policies Summary of Significant Accounting Policies - New Accounting Pronouncements (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 30, 2017 | Dec. 31, 2016 | Jan. 02, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost | $ 27.3 | $ 23.4 | $ 1.5
Service cost | 4.4 | $ 3.8 | $ 1.7
Minimum [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets | 4.0 |  |
Maximum [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets | $ 6.0 |  |

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