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Comprehensive Income, Reclassification Out of Accumulated Other Comprehensive Income (Loss) (Details) - Pension Costs [Member] - Reclassification out of Accumulated Other Comprehensive Loss [Member] - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jul. 01, 2018 | Jul. 02, 2017 | Jul. 01, 2018 | Jul. 02, 2017
Amortization of pension items [Abstract] |  |  |  |
Pre-tax amount | $ 2.4 | $ 1.8 | $ 4.9 | $ 3.7
Tax | (0.5) | (0.5) | (1.2) | (1.2)
Net of tax | $ 1.9 | $ 1.3 | $ 3.7 | $ 2.5

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