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Discontinued Operations (Details2) - Discontinued Operations [Member] - USD ($) $ in Millions | 12 Months Ended
--- | ---
May. 31, 2015 | May. 31, 2014 | May. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Revenues | $ 229.1 |  | $ 260.8 |  | $ 248.9 |
Operating costs and expenses (1) | 223.3 |  | 208.0 |  | 209.3 |
Interest income (expense) | 0.1 |  | 0.1 |  | 0.1 |
Gain (loss) on sale | 454.0 |  |  |  |  |
Earnings (loss) before income taxes | 459.9 |  | 52.9 |  | 39.7 |
Provision (benefit) for income taxes | 180.8 |  | 21.8 |  | 13.5 |
Earnings (loss) from discontinued operations, net of tax | 279.1 |  | 31.1 |  | 26.2 |
ED Tech [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Revenues | 217.4 |  | 246.4 |  | 226.1 |
Operating costs and expenses (1) | 208.8 | [1] | 193.0 | [2] | 180.6 | [3]
Interest income (expense) | 0.0 |  | 0.0 |  | 0.0 |
Gain (loss) on sale | 454.0 |  |  |  |  |
Earnings (loss) before income taxes | 462.6 |  | 53.4 |  | 45.5 |
Provision (benefit) for income taxes | 181.8 |  | 22.0 |  | 15.5 |
Earnings (loss) from discontinued operations, net of tax | 280.8 |  | 31.4 |  | 30.0 |
Unabsorbed overhead | 15.8 |  | 16.2 |  | 17.4 |
All Other [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Revenues | 11.7 |  | 14.4 |  | 22.8 |
Operating costs and expenses (1) | 14.5 |  | 15.0 |  | 28.7 |
Interest income (expense) | 0.1 |  | 0.1 |  | 0.1 |
Gain (loss) on sale | 0.0 |  |  |  |  |
Earnings (loss) before income taxes | (2.7) |  | (0.5) |  | (5.8) |
Provision (benefit) for income taxes | (1.0) |  | (0.2) |  | (2.0) |
Earnings (loss) from discontinued operations, net of tax | $ (1.7) |  | $ (0.3) |  | $ (3.8) |
[1] | Operating costs and expenses included costs related to unabsorbed overhead burden associated with the former educational technology and services business of $15.8.
[2] | Operating costs and expenses included costs related to unabsorbed overhead burden associated with the former educational technology and services business of $16.2.
[3] | Operating costs and expenses included costs related to unabsorbed overhead burden associated with the former educational technology and services business of $17.4.

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