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Consolidated Statement of Changes in Stockholders Equity (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
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May 31, 2020 | May 31, 2019 | May 31, 2018
Statement of Stockholders' Equity [Abstract] |  |  |
Pension and postretirement adjustments, tax portion | $ 0.4 | $ 0.5 | $ 20.9
Net effect |  | $ 16.0 |

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