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Income Taxes - Provision for Income Taxes From Continuing Operations (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Jan. 01, 2017
Jan. 03, 2016
Current tax expense:      
U.S. federal $ 6.6 $ 10.2 $ 8.3
U.S. state and local 2.4 2.4 1.4
Foreign 9.7 10.0 10.8
Total current 18.7 22.6 20.5
Deferred tax expense:      
U.S. federal 0.4 11.8 (10.6)
U.S. state and local 0.1 2.0 0.8
Foreign (6.4) (6.4) (2.0)
Total deferred (5.9) 7.4 (11.8) [1]
Total provision $ 12.8 $ 30.0 $ 8.7 [1]
[1] Fiscal year included 53 weeks.