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Goodwill and Other Intangibles - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Nov. 30, 2018
Nov. 30, 2019
Nov. 30, 2018
May 31, 2018
May 31, 2019
May 31, 2017
Goodwill and Other Intangibles (Details) [Line Items]            
Additions   $ 0.0 $ 0.0 $ 6.3    
Goodwill, Impaired, Accumulated Impairment Loss         $ 39.6 $ 39.6
Amortizable intangible assets acquired   0.0 0.6 4.5    
Amortization expense   $ 1.5 $ 1.3 $ 2.8    
Useful life   5 years 4 months 24 days        
U.K. Based Book Business [Member]            
Goodwill and Other Intangibles (Details) [Line Items]            
Amortizable intangible assets acquired $ 0.6          
Make Believe Ideas Limited (MBI)            
Goodwill and Other Intangibles (Details) [Line Items]            
Goodwill, Impaired, Accumulated Impairment Loss         $ 3.9