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Pension and Postretirement Benefit Plans
 6 Months Ended
Jun. 30, 2021
Retirement Benefits [Abstract]  
Pension and Postretirement Benefit Plans PENSION AND POSTRETIREMENT BENEFIT PLANS
    Net periodic pension and postretirement benefit cost for the Company’s defined pension and postretirement benefit plans for the three and six months ended June 30, 2021 and 2020 are set forth below (in millions):
Three Months Ended June 30,Six Months Ended June 30,
Pension benefits2021202020212020
Service cost$3.7 $4.0 $7.8 $8.0 
Interest cost3.2 4.1 6.4 8.2 
Expected return on plan assets(7.9)(7.0)(15.7)(14.1)
Amortization of net actuarial losses3.4 3.2 7.4 6.6 
Amortization of prior service cost0.1 0.6 0.6 1.1 
Curtailment(1)
— — (1.2)$— 
Net periodic pension cost$2.5 $4.9 $5.3 $9.8 
(1) During the six months ended June 30, 2021, the Company amended its Executive Nonqualified Pension Plan (“ENPP”) to freeze the plan as of December 31, 2024 to future salary benefit accruals, and to eliminate a life-time annuity feature for participants reaching age 65 subsequent to December 31, 2022. This amendment resulted in a curtailment gain related to the ENPP's net prior service credit.
Three Months Ended June 30,Six Months Ended June 30,
Postretirement benefits2021202020212020
Service cost$— $— $0.1 $— 
Interest cost0.2 0.3 0.4 0.6 
Amortization of net actuarial losses— — — 0.1 
Amortization of prior service cost— 0.1 — 0.1 
Net periodic postretirement benefit cost$0.2 $0.4 $0.5 $0.8 

    The components of net periodic pension and postretirement benefits cost, other than the service cost component, are included in “Other expense, net” in the Company’s Condensed Consolidated Statements of Operations.

    The following table summarizes the activity in accumulated other comprehensive loss related to the Company’s defined pension and postretirement benefit plans during the six months ended June 30, 2021 (in millions):
Before-Tax AmountIncome TaxAfter-Tax Amount
Accumulated other comprehensive loss as of December 31, 2020$(412.5)$(99.2)$(313.3)
Amortization of net actuarial losses7.4 1.9 5.5 
Amortization of prior service cost0.6 0.2 0.4 
Plan amendment(1)
31.2 8.0 23.2 
Accumulated other comprehensive loss as of June 30, 2021$(373.3)$(89.1)$(284.2)
(1) During the six months ended June 30, 2021, the Company amended its ENPP. The amendment resulted in a remeasurement gain of approximately $10.5 million as well as the impacts of approximately $12.2 million due to the elimination a life-time annuity feature and approximately $9.7 million due to the freezing of future salary benefits, partially offset by a curtailment gain of approximately $1.2 million.

    During the six months ended June 30, 2021, the Company made approximately $20.0 million of contributions to its defined pension benefit plans. The Company currently estimates its minimum contributions for 2021 to its defined pension benefit plans will aggregate approximately $36.9 million.

    During the six months ended June 30, 2021, the Company made approximately $0.6 million of contributions to its postretirement health care and life insurance benefit plans. The Company currently estimates that it will make approximately $1.5 million of contributions to its postretirement health care and life insurance benefit plans during 2021.