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Revenues - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Aug. 31, 2018 | May 31, 2018 | Aug. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Retained earnings | $ 952.1 | $ 1,065.2 | $ 1,022.2
Returns liability | 45.4 | 0.0 | $ 0.0
Return asset | 3.5 |  |
Deferred revenue recognized | $ 31.9 |  |
Adjustments due to adoption | ASU 2014-09 |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Retained earnings |  | (46.5) |
Returns liability |  | $ 28.3 |

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