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Investments (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Nov. 30, 2016
Nov. 30, 2015
Nov. 30, 2016
Nov. 30, 2015
May 31, 2016
Mar. 19, 2015
Investments (Details) [Line Items]            
Investments $ 27.4 $ 27.2 $ 27.4 $ 27.2 $ 26.2  
Proceeds from the sale of investments     0.0 3.3    
Gain on investments 0.0 2.2 0.0 2.2    
Income from equity method investments     4.9 2.4    
Make Believe Ideas Limited (MBI)            
Investments (Details) [Line Items]            
Percentage of interests acquired           48.50%
Equity method investment 8.1 8.2 8.1 8.2 8.0  
Children's Book Publishing and Distribution            
Investments (Details) [Line Items]            
Equity method investment $ 19.3 19.0 $ 19.3 19.0 18.1  
Equity method ownership percentage 26.20%   26.20%      
China Based Cost Method Investment            
Investments (Details) [Line Items]            
Proceeds from the sale of investments       3.3    
Gain on investments   2.2        
Other Investments            
Investments (Details) [Line Items]            
Investments $ 0.0 $ 0.0 $ 0.0 $ 0.0 $ 0.1