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Goodwill and Other Intangibles - Schedule of activity in goodwill (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Nov. 30, 2024
Nov. 30, 2023
May 31, 2024
May 31, 2023
Goodwill [Line Items]        
Gross goodwill     $ 172.4 $ 172.3
Goodwill, Impaired, Accumulated Impairment Loss     (39.6) $ (39.6)
Goodwill [Roll Forward]        
Beginning balance $ 132.8 $ 132.7 132.7  
Additions   0.0 0.0  
Foreign currency translation (1.6) 0.1 0.1  
Ending balance 202.2 132.8 132.8  
9 Story Media Group Inc.        
Goodwill [Roll Forward]        
Additions 70.1      
Measurement period adjustments 0.9 0.0 0.0  
Ending balance 71.0      
Measurement period adjustments 0.9 $ 0.0 $ 0.0  
Increase (decrease) to acquired deferred tax liabilities 1.4      
Increase (decrease) to acquired operating lease right of use assets 0.3      
Increase (decrease) to acquired lease libailtiies (0.1)      
Increase (decrease) to purchase price $ (0.1)