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Discontinued Operations - Revenues (Details) - Discontinued Operations - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Nov. 30, 2015
Nov. 30, 2014
Nov. 30, 2015
Nov. 30, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Revenues $ 0.2 $ 54.5 $ 0.3 $ 147.8
Operating costs and expenses 0.6 52.8 [1] 1.6 112.7 [1]
Interest income (expense) 0.1   0.1  
Earnings (loss) before income taxes (0.3) 1.7 (1.2) 35.1
Provision (benefit) for income taxes 0.0 0.8 (0.4) 14.4
Earnings (loss) from discontinued operations, net of tax (0.3) 0.9 (0.8) 20.7
Ed Tech        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Revenues 0.0 50.3 0.0 140.5
Operating costs and expenses 0.3 48.7 [1] 0.9 104.6 [1]
Interest income (expense) 0.0   0.0  
Earnings (loss) before income taxes (0.3) 1.6 (0.9) 35.9
Provision (benefit) for income taxes 0.0 0.8 (0.3) 14.7
Earnings (loss) from discontinued operations, net of tax (0.3) 0.8 (0.6) 21.2
Unabsorbed overhead   3.5 7.4  
Ed Tech | Cost of goods sold        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Unabsorbed overhead     0.1  
Ed Tech | Selling general and administrative expenses        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Unabsorbed overhead     7.3  
All Other        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Revenues 0.2 4.2 0.3 7.3
Operating costs and expenses 0.3 4.1 [1] 0.7 8.1 [1]
Interest income (expense) 0.1   0.1  
Earnings (loss) before income taxes 0.0 0.1 (0.3) (0.8)
Provision (benefit) for income taxes 0.0 0.0 (0.1) (0.3)
Earnings (loss) from discontinued operations, net of tax $ 0.0 $ 0.1 $ (0.2) $ (0.5)
[1] For the three and six months ended November 30, 2014, Operating costs and expenses of the continuing operations included costs related to unabsorbed overhead burden associated with the Ed Tech business of $3.5 and $7.4, respectively. These costs were included in the Overhead segment. For the three months ended November 30, 2014, these costs were recorded in Selling general and administrative expenses. For the six months ended November 30, 2014, $0.1 of the costs were recorded in Cost of goods sold and $7.3 were recorded in Selling general and administrative expenses.