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Investments (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Sep. 11, 2013
May 06, 2013
Jan. 31, 2011
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2017
Web International Education Group, Ltd.(Web)            
Investments            
Investment   $ 10.0 $ 10.0      
Ownership percentage     20.00%      
Impairment of investment in Web International Education Group, Ltd       $ 10.0    
Web International Education Group, Ltd.(Web) | Other current assets            
Investments            
Investment reclassified   $ 10.0        
School Mortgage            
Investments            
Interest on investment (as a percent) 5.25%          
Issuance of a mortgage note $ 2.1          
Note receivable term 5 years          
Fair value of assets held for sale         $ 1.2  
Impairment loss         $ 0.6 $ 0.0