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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Statement of Comprehensive Income [Abstract]      
Net (loss) / income $ (1.9) $ 26.9 $ 29.9
Other comprehensive income / (loss)      
Net change in foreign currency translation adjustment 7.3 (13.2) (0.8)
Pension and post-retirement gains, net of $7.5, $3.1 and $10.6 of tax, respectively 14.2 8.8 31.6
Other comprehensive income / (loss) net of tax 21.5 (4.4) 30.8
Total comprehensive income $ 19.6 $ 22.5 $ 60.7