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Discontinued Operations - Assets and Liabilities (Details) - USD ($) $ in Millions | Nov. 30, 2015 | May. 31, 2015 | Nov. 30, 2014
--- | --- | --- | ---
Disposal Group, Including Discontinued Operation, Assets, Current [Abstract] |  |  |
Current assets of discontinued operations | $ 0.6 | $ 3.1 | $ 57.8
Disposal Group, Including Discontinued Operation, Assets, Noncurrent [Abstract] |  |  |
Noncurrent assets of discontinued operations | 0.0 | 0.0 | 118.6
Disposal Group, Including Discontinued Operation, Liabilities, Current [Abstract] |  |  |
Current liabilities of discontinued operations | 1.6 | 14.1 | 65.9
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent [Abstract] |  |  |
Noncurrent liabilities of discontinued operations | 0.0 | 0.0 | 0.6
Discontinued Operations |  |  |
Disposal Group, Including Discontinued Operation, Assets, Current [Abstract] |  |  |
Accounts receivable, net | 0.1 | 2.5 | 43.2
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 | 57.8
Disposal Group, Including Discontinued Operation, Assets, Noncurrent [Abstract] |  |  |
Property, plant and equipment, net | 0.0 | 0.0 | 2.0
Prepublication costs, net | 0.0 | 0.0 | 88.5
Royalty advances, net | 0.0 | 0.0 | 1.1
Goodwill | 0.0 | 0.0 | 22.7
Other intangibles, net | 0.0 | 0.0 | 4.1
Other assets and deferred charges | 0.0 | 0.0 | 0.2
Noncurrent assets of discontinued operations | 0.0 | 0.0 | 118.6
Disposal Group, Including Discontinued Operation, Liabilities, Current [Abstract] |  |  |
Capital lease obligation | 0.0 | 0.0 | 0.4
Accounts payable | 0.0 | 0.1 | 9.1
Accrued royalties | 0.1 | 0.7 | 4.8
Deferred revenue | 0.1 | 0.1 | 47.0
Other accrued expenses | 1.4 | 13.2 | 4.6
Current liabilities of discontinued operations | 1.6 | 14.1 | 65.9
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent [Abstract] |  |  |
Capital lease obligation | 0.0 | 0.0 | 0.5
Other noncurrent liabilities | 0.0 | 0.0 | 0.1
Noncurrent liabilities of discontinued operations | $ 0.0 | $ 0.0 | $ 0.6

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