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Investment in Persol Holdings - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Oct. 01, 2017
Sep. 30, 2018
Oct. 01, 2017
Jan. 01, 2018
Gain (Loss) on Securities [Line Items]          
Gain (loss) on investment in Persol Holdings $ 15.8 $ 0.0 $ (13.0) $ 0.0  
Unrealized gains on investment, net of tax $ 0.0 28.8 $ 0.0 48.6  
Persol Holdings Investment          
Gain (Loss) on Securities [Line Items]          
Unrealized gains on investment, net of tax   $ 28.8   $ 48.6  
OCI & AOCI          
Gain (Loss) on Securities [Line Items]          
Cumulative effect adjustment         $ 140.0
Cumulative effect adjustment, taxes         $ 69.9