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Investment in Persol Holdings - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 30, 2018
Sep. 30, 2018
Jul. 01, 2018
Apr. 01, 2018
Dec. 30, 2018
Dec. 31, 2017
Jan. 01, 2017
Jan. 01, 2018
Gain (Loss) on Securities [Line Items]                
Loss on investment in Persol Holdings $ (83.2) $ 15.8 $ (52.5) $ 23.7 $ (96.2) $ 0.0 $ 0.0  
Unrealized gain (loss) on available-for-sale investment, net of tax         $ 0.0 56.2 $ (1.1)  
Persol Holdings Investment                
Gain (Loss) on Securities [Line Items]                
Unrealized gain (loss) on available-for-sale investment, net of tax           $ 56.2    
OCI & AOCI                
Gain (Loss) on Securities [Line Items]                
Cumulative effect of new accounting principle in period of adoption               $ 140.0
Cumulative effect of new accounting principle in period of adoption, taxes               $ 69.9