XML 133 R112.htm IDEA: XBRL DOCUMENT v3.22.0.1
Pension Benefits - Components of Comprehensive Pension Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]      
Pension Obligation Settlement Costs   $ 64.1  
Pension Plans, Defined Benefit      
Defined Benefit Plan Disclosure [Line Items]      
Service Cost Earned During the Year $ 0.0 0.0 $ 0.0
Interest Cost on Projected Benefit Obligation 7.2 16.5 22.3
Expected Return on Plan Assets (9.5) (27.6) (30.6)
Amortization of Actuarial Loss 2.9 5.6 2.9
Pension expense 0.6 58.6 (5.4)
Unrecognized Pension Gain (Loss) Arising During the Year (6.0) (7.8) 4.2
Amortization of Prior Service Credit 18.3    
Amortization of Accumulated Unrecognized Pension Loss (2.9) (69.8) (2.9)
Comprehensive Pension Expense (Income) $ 10.0 $ (19.0) $ (4.1)