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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME      
Decrease (increase) in pension and other post-retirement benefits, income tax $ (0.2) $ 1.2 $ (1.9)
Unrealized gain of the period tax $ 0.2 $ 0.3