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Investments (Details) - USD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Feb. 28, 2017 | Feb. 29, 2016 | May 31, 2016 | Mar. 19, 2015
Investments (Details) [Line Items] |  |  |  |
Investments | $ 27.1 | $ 25.7 | $ 26.2 |
Proceeds from the sale of investments | 0.0 | 3.3 |  |
Income from equity method investments | 4.9 | 3.0 |  |
Make Believe Ideas Limited (MBI) |  |  |  |
Investments (Details) [Line Items] |  |  |  |
Percentage of interests acquired |  |  |  | 48.50%
Equity method investment | 8.0 | 7.8 | 8.0 |
Children's Book Publishing and Distribution |  |  |  |
Investments (Details) [Line Items] |  |  |  |
Equity method investment | $ 19.1 | 17.9 | 18.1 |
Equity method ownership percentage | 26.20% |  |  |
Other Investments |  |  |  |
Investments (Details) [Line Items] |  |  |  |
Investments | $ 0.0 | $ 0.0 | $ 0.1 |

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