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Fair Value Measurements (Details) - Schedule of non-financial assets measured and recorded at fair value on a non-recurring basis - USD ($)
$ in Millions
 12 Months Ended
May 31, 2021
May 31, 2020
May 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Asset impairments and write downs $ 11.1 $ 40.6 $ 0.9
Additions 0.0 1.6  
Fair Value, Nonrecurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Property, plant and equipment, net 0.0 0.0 0.0
Impairment of Long-Lived Assets to be Disposed of   0.6 0.9
Author advances   0.0  
Author Advances, Property, plant and equipment, net   1.6  
Prepublication assets   0.5  
Prepublication costs   0.8  
Asset impairments and write downs 1.5    
Investment acquired     6.0
Investments Impairment Loss     0.0
Intangible assets   1.5 4.9
Impairment, Intangible assets   0.0 0.0
Additions   0.0  
Operating Lease, Right-Of-Use Asset, Fair Value Disclosure 8.1    
Fair Value, Nonrecurring | Operating lease right-of-use assets, net      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Asset impairments and write downs 9.6    
Additions 0.0    
Fair Value, Nonrecurring | Property, plant and equipment, net      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Additions 0.0 0.0 0.0
Fair Value, Nonrecurring | Prepublication assets      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Additions   0.0  
Fair Value, Nonrecurring | Intangible assets      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Intangible assets acquired   1.6 5.1
Fair Value, Nonrecurring | Investment acquired      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Additions     6.0
Fair Value, Nonrecurring | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Property, plant and equipment, net 0.0 0.0 0.0
Author advances   0.0  
Prepublication assets   0.0  
Investment acquired     0.0
Intangible assets   0.0 0.0
Operating Lease, Right-Of-Use Asset, Fair Value Disclosure 0.0    
Fair Value, Nonrecurring | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Property, plant and equipment, net 0.0 0.0 0.0
Author advances   0.0  
Prepublication assets   0.0  
Investment acquired     0.0
Intangible assets   0.0 0.0
Operating Lease, Right-Of-Use Asset, Fair Value Disclosure 0.0    
Fair Value, Nonrecurring | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Property, plant and equipment, net 0.0 0.0 0.0
Author advances   0.0  
Prepublication assets   0.5  
Investment acquired     6.0
Intangible assets   $ 1.6 $ 5.1
Operating Lease, Right-Of-Use Asset, Fair Value Disclosure $ 9.1