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EMPLOYEE BENEFIT PLANS (Tables)
 9 Months Ended
Sep. 30, 2021
Pension Plan  
Defined Benefit Plans and Other Postretirement Benefit Plans  
Schedule of Aggregated Net Periodic Benefit Cost and Other Benefit Cost The following table sets forth the aggregated net periodic benefit cost for all pension plans for the third quarters and nine months ended September 30, 2021 and September 30, 2020:
(In millions)Pension Benefits
Third Quarter EndedNine Months Ended
 September 30, 2021September 30, 2020September 30, 2021September 30, 2020
Service cost$0.2 $0.2 $0.6 $0.5 
Interest cost0.7 1.1 2.1 3.3 
Expected return on assets(1.3)(1.7)(4.1)(5.1)
Amortization of:
Prior service cost1.2 — 3.3 — 
Actuarial loss— 1.0 — 2.8 
Settlement cost— — — — 
Net periodic benefit cost$0.8 $0.6 $1.9 $1.5 
Other Benefits  
Defined Benefit Plans and Other Postretirement Benefit Plans  
Schedule of Aggregated Net Periodic Benefit Cost and Other Benefit Cost
The following table sets forth the aggregated net periodic benefit cost for the other post-retirement benefit plan for the third quarters and nine months ended September 30, 2021 and September 30, 2020:

(In millions)Other Benefits
Third Quarter EndedNine Months Ended
September 30, 2021September 30, 2020September 30, 2021September 30, 2020
Service cost$— $— $— $— 
Interest cost— 0.1 0.1 0.2 
Expected return on assets— — — — 
Amortization of:
Prior service cost— — 0.1 — 
Actuarial loss— — — — 
Settlement cost— — — — 
Net periodic benefit cost$— $0.1 $0.2 $0.2