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Acquisitions and Investments - Investments (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Sep. 11, 2013
May 06, 2013
Jan. 31, 2011
Mar. 31, 2017
Jun. 30, 2018
Jun. 30, 2016
Investments            
Fair value of assets held for sale       $ 1.2    
Impairment loss       $ 0.6    
Web International Education Group, Ltd. (Web)            
Investments            
Investment     $ 10.0      
Ownership percentage     20.00%      
Web International Education Group, Ltd. (Web) | Other current assets            
Investments            
Investment reclassified   $ 10.0     $ 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          
Impairment loss on property           $ 0.2