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Consolidated Statement of Comprehensive Income/(Loss) (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Statement of comprehensive income [abstract]      
Currency translation effects, tax expense (benefit) $ 0.4 $ (6.0)  
Actuarial gains/(losses) from defined benefit plans, tax expense (benefit) 40.0 $ 11.0 $ (13.0)
Fair value adjustments on equity securities, tax expense (benefit) $ (1.0)   $ (3.0)