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Discontinued Operations (Details3) - USD ($)
$ in Millions
May. 31, 2015
May. 31, 2014
Current Assets    
Current assets of discontinued operations $ 3.1 $ 58.7
Noncurrent Assets    
Noncurrent assets of discontinued operations 0.0 119.9
Current Liabilities    
Current liabilities of discontinued operations 14.1 49.5
Discontinued Operations [Member]    
Current Assets    
Accounts receivable, net 2.5 41.2
Inventories, net 0.1 16.3
Prepaid expenses and other current assets 0.5 1.2
Current assets of discontinued operations 3.1 58.7
Noncurrent Assets    
Property, plant and equipment, net 0.0 1.6
Prepublication costs, net 0.0 89.8
Royalty advances, net 0.0 1.1
Goodwill 0.0 22.7
Other intangibles, net 0.0 4.3
Other assets and deferred charges 0.0 0.4
Noncurrent assets of discontinued operations 0.0 119.9
Current Liabilities    
Accounts payable 0.1 7.8
Accrued royalties 0.7 3.4
Deferred revenue 0.1 28.8
Other accrued expenses 13.2 9.5
Current liabilities of discontinued operations $ 14.1 $ 49.5