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Investment in Persol Holdings - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jul. 01, 2018
Jul. 02, 2017
Jul. 01, 2018
Jul. 02, 2017
Jan. 01, 2018
Gain (Loss) on Securities [Line Items]          
Loss on investment in Persol Holdings $ (52.5) $ 0.0 $ (28.8) $ 0.0  
Unrealized gains on investment, net of tax $ 0.0 0.9 $ 0.0 19.8  
Persol Holdings Investment          
Gain (Loss) on Securities [Line Items]          
Unrealized gains on investment, net of tax   $ 0.9   $ 19.8  
OCI & AOCI          
Gain (Loss) on Securities [Line Items]          
Cumulative effect adjustment         $ 140.0
Cumulative effect adjustment, taxes         $ 69.9