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Acquisition - Fair Value of Assets Assumed and Liabilities Acquired (Details) - USD ($)
$ in Millions
Dec. 30, 2018
Dec. 31, 2017
Sep. 05, 2017
Business Acquisition [Line Items]      
Goodwill $ 107.3 $ 107.1  
Teachers On Call, Inc.      
Business Acquisition [Line Items]      
Cash     $ 1.8
Other current assets     3.6
Goodwill     18.7
Intangibles     18.3
Other noncurrent assets     0.5
Current liabilities     (3.9)
Purchase price paid at closing     $ 39.0