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Investments (Details) - USD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Feb. 28, 2018 | Feb. 28, 2017 | May 31, 2017 | Mar. 19, 2015
Investments (Details) [Line Items] |  |  |  |
Investments | $ 33.1 | $ 27.1 | $ 28.6 |
Income from equity method investments | 3.7 | 4.9 |  |
Make Believe Ideas Limited (MBI) |  |  |  |
Investments (Details) [Line Items] |  |  |  |
Percentage of interests acquired |  |  |  | 48.50%
Equity method investment | 11.2 | 8.0 | 8.6 |
Children's Book Publishing and Distribution |  |  |  |
Investments (Details) [Line Items] |  |  |  |
Equity method investment | $ 21.8 | 19.1 | 20.0 |
Equity method ownership percentage | 26.20% |  |  |
Other Investments |  |  |  |
Investments (Details) [Line Items] |  |  |  |
Investments | $ 0.1 | $ 0.1 | $ 0.1 |

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