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Income Taxes - Differences Between Income Taxes From Continuing Operations and U.S. Statutory Rate (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Jan. 01, 2017
Jan. 03, 2016
Income Tax Disclosure [Abstract]      
Income tax based on statutory rate $ 28.6 $ 52.4 $ 22.1
State income taxes, net of federal benefit 1.6 2.9 1.3
General business credits (18.1) (17.0) (17.9)
Life insurance cash surrender value (7.4) (3.0) 0.3
Foreign items (2.8) 0.4 (2.5)
Foreign business taxes 4.0 3.6 3.7
Tax law change 13.9 0.0 (0.7)
PersolKelly Asia Pacific transaction gain 0.0 (4.8) 0.0
Non-deductible expenses 1.3 1.6 2.3
Change in deferred tax realizability (7.8) (5.9) 0.0
Other, net (0.5) (0.2) 0.1
Total provision $ 12.8 $ 30.0 $ 8.7 [1]
[1] Fiscal year included 53 weeks.