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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Statement of Comprehensive Income [Abstract]      
Pension and post-retirement actuarial gains / (losses), tax $ 10.6 $ 4.8 $ 0.9
Cash flow hedges , tax $ 0.0 $ 0.0 $ 0.1