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Investments (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Nov. 30, 2018
Nov. 30, 2017
Nov. 30, 2018
Nov. 30, 2017
May 31, 2018
Mar. 19, 2015
Investments (Details) [Line Items]            
Investments $ 0.0 $ 31.6 $ 0.0 $ 31.6 $ 31.1  
Income from equity method investments 2.5 1.5 4.5 2.7    
Make Believe Ideas Limited (MBI)            
Investments (Details) [Line Items]            
Percentage of interests acquired           48.50%
Equity method investment 12.3 10.6 12.3 10.6 10.6  
Children's Book Publishing and Distribution            
Investments (Details) [Line Items]            
Equity method investment $ 22.0 21.0 $ 22.0 21.0 20.5  
Equity method ownership percentage 26.20%   26.20%      
Other Investments            
Investments (Details) [Line Items]            
Investments $ 0.1 $ 0.1 $ 0.1 $ 0.1 $ 0.1