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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME |  |  |
Decrease (increase) in pension and other post-retirement benefits, income tax | $ (0.4) | $ (0.2) | $ 1.2
Unrealized gain of the period tax |  | $ 0.2 | $ 0.3

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