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Investments (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Aug. 31, 2018 | Aug. 31, 2017 | May 31, 2018 | Mar. 19, 2015
Investments (Details) [Line Items] |  |  |  |
Investments | $ 32.3 | $ 28.7 | $ 31.1 |
Income from equity method investments | 2.0 | 1.2 |  |
Make Believe Ideas Limited (MBI) |  |  |  |
Investments (Details) [Line Items] |  |  |  |
Percentage of interests acquired |  |  |  | 48.50%
Equity method investment | 11.2 | 9.3 | 10.6 |
Children's Book Publishing and Distribution |  |  |  |
Investments (Details) [Line Items] |  |  |  |
Equity method investment | $ 21.1 | 19.4 | 20.5 |
Equity method ownership percentage | 26.20% |  |  |
Other Investments |  |  |  |
Investments (Details) [Line Items] |  |  |  |
Investments | $ 0.1 | $ 0.1 | $ 0.1 |

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