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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - USD ($) $ in Millions | 3 Months Ended
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Aug. 31, 2020 | Aug. 31, 2019
Pension and postretirement adjustments, tax portion | $ 0.0 | $ 0.0
Common Class A |  |
Dividends declared per class A and common share (in Dollars per share) | $ 0.15 | $ 0.15

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