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Acquisition - Fair Value of Assets Assumed and Liabilities Acquired (Details) - USD ($)
$ in Millions
Oct. 01, 2017
Sep. 05, 2017
Jan. 01, 2017
Business Acquisition [Line Items]      
Goodwill $ 107.1   $ 88.4
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