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Retirement Benefits - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 29, 2019 | Dec. 30, 2018 | Dec. 31, 2017
Retirement Benefits [Abstract] |  |  |
Liability for nonqualified plans | $ 202.7 | $ 174.8 |
Earnings (loss) included in SG&A expenses | 32.5 | (8.6) | $ 22.3
Life insurance cash surrender value | 200.6 | 172.5 |
Proceeds from company-owned life insurance | 3.0 | 7.9 | 0.0
Tax-free earnings (loss) included in SG&A expenses | 32.2 | (8.8) | 22.3
Net expense for retirement benefits | 9.1 | 9.5 | 8.6
Benefit obligation | 14.8 | 11.7 |
Fair value of plan assets | 9.8 | 7.9 |
Unfunded liability | 5.0 | 3.8 |
Pension expense | $ 0.3 | $ 0.5 | $ 0.4

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