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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 01, 2018 | Dec. 31, 2017 | Jul. 02, 2017 | Jul. 01, 2018 | Jul. 02, 2017 | Dec. 31, 2017
Income Taxes [Abstract] |  |  |  |  |  |
U.S. corporate income tax rate |  |  |  | 21.00% |  | 35.00%
Provisional income tax benefit |  | $ (47.3) |  |  |  |
Amount of unrecognized tax benefits | $ 15.4 |  |  | $ 15.4 |  |
Unrecognized tax benefits that would impact effective tax rate | 11.1 |  |  | 11.1 |  |
Unrecognized tax benefits, net increase in penalties and interest expenses | 0.2 |  |  | 0.5 |  |
Unrecognized tax benefits, accrued interest and penalties | 2.0 |  |  | 2.0 |  |
Provision for taxes on income | $ 10.3 |  | $ 13.4 | $ 19.6 | $ 23.5 |
Effective income tax rate |  |  |  | 18.90% | 22.90% |

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