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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, 2015
May. 31, 2014
May. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Interest rate 0.00% 0.00% 5.00%
Impairment, Goodwill $ 5.4 $ 13.4  
Fair Value, Measurements, Nonrecurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments   0.0  
Impairment, Investments   5.8  
Other intangible assets     $ 0.3
Impairment, Other intangible assets     0.0
Property, plant and equipment, net 0.0 0.0 0.0
Impairment, Property, plant and equipment, net 7.5 7.6 5.2
Goodwill 0.0 0.0  
Impairment, Goodwill 5.4 13.4  
Production assets 0.0    
Impairment, Production assets 2.9    
Prepublication assets   0.0 0.0
Impairment, Prepublication assets   5.7 2.0
Fair Value, Measurements, Nonrecurring [Member] | Investments [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Additions due to acquisition   1.0  
Fair Value, Measurements, Nonrecurring [Member] | Property, Plant and Equipment, Net [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Additions due to acquisition 0.0 0.0 0.0
Fair Value, Measurements, Nonrecurring [Member] | Goodwill [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Additions due to acquisition 0.0 0.0  
Fair Value, Measurements, Nonrecurring [Member] | Production Assets [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Additions due to acquisition 0.0    
Fair Value, Measurements, Nonrecurring [Member] | Prepublication Assets [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Additions due to acquisition   0.0 0.0
Fair Value, Measurements, Nonrecurring [Member] | Other Intangible Assets [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Additions due to acquisition     0.3
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments   0.0  
Other intangible assets     0.0
Property, plant and equipment, net 0.0 0.0 0.0
Goodwill 0.0 0.0  
Production assets 0.0    
Prepublication assets   0.0 0.0
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments   0.0  
Other intangible assets     0.3
Property, plant and equipment, net 0.0 0.0 0.0
Goodwill 0.0 0.0  
Production assets 0.0    
Prepublication assets   0.0 0.0
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments   0.0  
Other intangible assets     0.0
Property, plant and equipment, net 0.0 0.0 0.0
Goodwill 0.0 0.0  
Production assets $ 0.0    
Prepublication assets   $ 0.0 $ 0.0