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Employee Benefit Plans (Other Retirement Plans) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 28, 2019 | Dec. 29, 2018 | Dec. 30, 2017
Switzerland |  |  |
Employee Benefit Plans |  |  |
Pension gain (expense) | $ 0.7 | $ (0.6) | $ (1.8)
Employee benefit plan obligations included in other long-term liabilities | 17.0 | 9.5 |
France |  |  |
Employee Benefit Plans |  |  |
Pension gain (expense) | (0.4) | 0.4 | 0.7
Employee benefit plan obligations included in other long-term liabilities | 1.2 | 0.8 |
Restricted Stock and Restricted Stock Units |  |  |
Employee Benefit Plans |  |  |
Fair value of restricted stock and restricted stock units, vested | $ 17.6 | $ 16.6 | $ 6.3

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