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Pensions and Post Retirement Benefits - Pre-tax Actuarial Gains and (Losses) Recognized (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of net defined benefit liability (asset) [line items]    
Gain (loss) on defined benefit pension plans $ (88.3) $ (99.1)
Defined benefit pension plans    
Disclosure of net defined benefit liability (asset) [line items]    
Actuarial net gains on plan assets and change in asset ceiling 17.6 18.8
Actuarial net losses on benefit obligations (101.5) (109.9)
Gain (loss) on defined benefit pension plans (83.9) (91.1)
Post retirement benefit plans    
Disclosure of net defined benefit liability (asset) [line items]    
Actuarial net losses on benefit obligations $ (4.4) $ (8.0)