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Investments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
May 31, 2018 | May 31, 2017 | May 31, 2016
Investments (Details) [Line Items] |  |  |
Investments | $ 31.1 | $ 28.6 |
Income (loss) from equity method investments | 4.8 | 5.3 | $ 3.5
Make Believe Ideas Limited (MBI) [Member] |  |  |
Investments (Details) [Line Items] |  |  |
Equity method investments | $ 10.6 | 8.6 |
Non-controlling interest held | 48.50% |  |
Children's Book Publishing and Distribution [Member] |  |  |
Investments (Details) [Line Items] |  |  |
Equity method investments | $ 20.5 | 20.0 |
Non-controlling interest held | 26.20% |  |
Other Investments [Member] |  |  |
Investments (Details) [Line Items] |  |  |
Investments | $ 0.1 | 0.1 |
Cost Method Investment in China [Member] |  |  |
Investments (Details) [Line Items] |  |  |
Gain on sale of cost method investments |  | $ 2.2 |

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