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Retirement Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 30, 2018 | Dec. 31, 2017 | Jan. 01, 2017
Retirement Benefits [Abstract] |  |  |
Liability for nonqualified plans | $ 174.8 | $ 188.3 |
Earnings (loss) included in SG&A expenses | (8.6) | 22.3 | $ 10.5
Life insurance cash surrender value | 172.5 | 188.7 |
Proceeds from company-owned life insurance | 7.9 | 0.0 | 0.0
Tax-free earnings (loss) included in SG&A expenses | (8.8) | 22.3 | 9.7
Net expense for retirement benefits | 9.5 | 8.6 | 9.0
Benefit obligation | 11.7 | 13.3 |
Fair value of plan assets | 7.9 | 8.4 |
Unfunded liability | 3.8 | 4.9 |
Pension expense | $ 0.5 | $ 0.4 | $ 0.4

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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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