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Discontinued Operations - Assets and Liabilities (Details) - USD ($)
$ in Millions
Feb. 29, 2016
May. 31, 2015
Feb. 28, 2015
Disposal Group, Including Discontinued Operation, Assets, Current [Abstract]      
Current assets of discontinued operations $ 0.6 $ 3.1 $ 44.4
Disposal Group, Including Discontinued Operation, Assets, Noncurrent [Abstract]      
Noncurrent assets of discontinued operations 0.0 0.0 119.8
Disposal Group, Including Discontinued Operation, Liabilities, Current [Abstract]      
Current liabilities of discontinued operations 1.5 14.1 56.4
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent [Abstract]      
Noncurrent liabilities of discontinued operations 0.0 0.0 0.8
Discontinued Operations      
Disposal Group, Including Discontinued Operation, Assets, Current [Abstract]      
Accounts receivable, net 0.1 2.5 29.8
Inventories, net 0.0 0.1 13.5
Prepaid expenses and other current assets 0.5 0.5 1.1
Current assets of discontinued operations 0.6 3.1 44.4
Disposal Group, Including Discontinued Operation, Assets, Noncurrent [Abstract]      
Property, plant and equipment, net 0.0 0.0 1.7
Prepublication costs, net 0.0 0.0 90.1
Royalty advances, net 0.0 0.0 1.0
Goodwill 0.0 0.0 22.7
Other intangibles, net 0.0 0.0 4.0
Other assets and deferred charges 0.0 0.0 0.3
Noncurrent assets of discontinued operations 0.0 0.0 119.8
Disposal Group, Including Discontinued Operation, Liabilities, Current [Abstract]      
Capital lease obligation 0.0 0.0 0.4
Accounts payable 0.0 0.1 9.9
Accrued royalties 0.1 0.7 5.2
Deferred revenue 0.1 0.1 35.2
Other accrued expenses 1.3 13.2 5.7
Current liabilities of discontinued operations 1.5 14.1 56.4
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent [Abstract]      
Capital lease obligation 0.0 0.0 0.5
Other noncurrent liabilities 0.0 0.0 0.3
Noncurrent liabilities of discontinued operations $ 0.0 $ 0.0 $ 0.8