Annual report pursuant to Section 13 and 15(d)

BENEFIT PLANS - Reconciliation of Projected Benefit Obligations, Plan Assets and Funded Status of Plans (Details)

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BENEFIT PLANS - Reconciliation of Projected Benefit Obligations, Plan Assets and Funded Status of Plans (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Pension Benefits      
Change in projected benefit obligation      
Benefit obligation at January 1, $ 720.0 $ 666.0  
Service cost 1.7 2.8 $ 3.6
Interest cost 23.5 28.3 26.4
Plan participants’ contributions 0.0 0.0  
Amendments 0.0 (6.7)  
Actuarial loss (gain) 63.2 71.0  
Foreign currency exchange rate changes 1.3 1.9  
Curtailments 0.0 (0.3)  
Benefits paid (43.2) (43.0)  
Projected benefit obligation at December 31, 766.5 720.0 666.0
Change in plan assets      
Fair value of plan assets at January 1, 603.2 533.8  
Actual return on plan assets 70.5 104.8  
Employer contributions 6.7 6.0  
Plan participants’ contributions 0.0 0.0  
Foreign currency exchange rate changes 1.2 1.6  
Other disbursements 0.0 0.0  
Benefits paid (43.2) (43.0)  
Fair value of plan assets at December 31, 638.4 603.2 533.8
Funded status of plan (128.1) (116.8)  
Other Benefits      
Change in projected benefit obligation      
Benefit obligation at January 1, 18.7 21.9  
Service cost 0.2 0.3 0.4
Interest cost 0.6 0.9 0.8
Plan participants’ contributions 1.2 0.8  
Amendments 0.0 0.0  
Actuarial loss (gain) 2.7 (2.9)  
Foreign currency exchange rate changes 0.0 0.1  
Curtailments 0.0 0.0  
Benefits paid (2.7) (2.4)  
Projected benefit obligation at December 31, 20.7 18.7 21.9
Change in plan assets      
Fair value of plan assets at January 1, 15.4 13.9  
Actual return on plan assets 1.8 3.0  
Employer contributions 1.5 1.6  
Plan participants’ contributions 1.2 0.8  
Foreign currency exchange rate changes 0.0 0.0  
Other disbursements (1.4) (1.5)  
Benefits paid (2.7) (2.4)  
Fair value of plan assets at December 31, 15.8 15.4 $ 13.9
Funded status of plan $ (4.9) $ (3.3)