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Goodwill and Other Intangibles - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 30, 2018 | Nov. 30, 2019 | Nov. 30, 2018 | May 31, 2018 | May 31, 2019 | May 31, 2017
Goodwill and Other Intangibles (Details) [Line Items] |  |  |  |  |  |
Additions |  | $ 0.0 | $ 0.0 | $ 6.3 |  |
Goodwill, Impaired, Accumulated Impairment Loss |  |  |  |  | $ 39.6 | $ 39.6
Amortizable intangible assets acquired |  | 0.0 | 0.6 | 4.5 |  |
Amortization expense |  | $ 1.5 | $ 1.3 | $ 2.8 |  |
Useful life |  | 5 years 4 months 24 days |  |  |  |
U.K. Based Book Business [Member] |  |  |  |  |  |
Goodwill and Other Intangibles (Details) [Line Items] |  |  |  |  |  |
Amortizable intangible assets acquired | $ 0.6 |  |  |  |  |
Make Believe Ideas Limited (MBI) |  |  |  |  |  |
Goodwill and Other Intangibles (Details) [Line Items] |  |  |  |  |  |
Goodwill, Impaired, Accumulated Impairment Loss |  |  |  |  | $ 3.9 |

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