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Pension and Postretirement Benefit Plans | 9 Months Ended
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Sep. 30, 2022
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 nine months ended September 30, 2022 and 2021 are set forth below (in millions):
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
Pension benefits |  | 2022 |  | 2021 |  | 2022 |  | 2021
Service cost |  | $ | 3.2 |  |  | $ | 3.7 |  |  | $ | 9.8 |  |  | $ | 11.5 |
Interest cost |  | 3.6 |  |  | 3.3 |  |  | 11.4 |  |  | 9.7 |
Expected return on plan assets |  | (4.1) |  |  | (8.0) |  |  | (13.1) |  |  | (23.7) |
Amortization of net actuarial losses |  | 2.0 |  |  | 3.3 |  |  | 6.4 |  |  | 10.7 |
Amortization of prior service cost |  | — |  |  | — |  |  | 0.1 |  |  | 0.6 |
Curtailment(1) |  | — |  |  | — |  |  | — |  |  | $ | (1.2) |
Net periodic pension cost |  | $ | 4.7 |  |  | $ | 2.3 |  |  | $ | 14.6 |  |  | $ | 7.6 |
(1) During the nine months ended September 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 September 30, |  | Nine Months Ended September 30,
Postretirement benefits |  | 2022 |  | 2021 |  | 2022 |  | 2021
Service cost |  | $ | — |  |  | $ | — |  |  | $ | 0.1 |  |  | $ | 0.1 |
Interest cost |  | 0.2 |  |  | 0.2 |  |  | 0.7 |  |  | 0.6 |
Amortization of net actuarial losses |  | — |  |  | 0.1 |  |  | — |  |  | 0.1 |
Amortization of prior service cost |  | — |  |  | 0.1 |  |  | 0.1 |  |  | 0.1 |
Net periodic postretirement benefit cost |  | $ | 0.2 |  |  | $ | 0.4 |  |  | $ | 0.9 |  |  | $ | 0.9 |
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 nine months ended September 30, 2022 (in millions):
| Before-Tax Amount |  | Income Tax |  | After-Tax Amount
Accumulated other comprehensive loss, December 31, 2021 | $ | (302.4) |  |  | $ | (72.0) |  |  | $ | (230.4) |
Amortization of net actuarial losses | 6.4 |  |  | 1.7 |  |  | 4.7 |
Amortization of prior service cost | 0.2 |  |  | 0.1 |  |  | 0.1 |
Revision of prior service cost estimate | (24.4) |  |  | (6.1) |  |  | (18.3) |
Accumulated other comprehensive loss as of September 30, 2022 | $ | (320.2) |  |  | $ | (76.3) |  |  | $ | (243.9) |
The Company’s defined benefit pension obligation has been reflected on the manner in which its defined benefit plans are being administered or expected to be administered in the future. The obligation and resulting liability or asset is calculated employing both actuarial and legal assumptions. These assumptions include, but are not limited to, future inflation, the return on pension assets, discount rates, life expectancy and potential salary increases. There are also assumptions related to the manner in which individual benefit plan benefits are calculated, some of which are legal in nature and include, but are not limited to, member eligibility, years of service, and the uniformity of both guaranteed minimum pension benefits and member normal retirement ages for men and women. Some of these assumptions also are subject to the outcome of certain legal cases, which are currently unknown. In the event that any of these assumptions or the administration approach are proven to be different from the Company’s current interpretations and approach, there could be material increases or decreases in the Company’s defined benefit pension obligation and related amounts such as prior service cost and actuarial gains and losses, as well as the related amount and timing of future contributions to be paid by the Company. During the three months ended September 30, 2022, the Company updated its estimate of current assumptions, interpretations and approach affecting the Company’s defined benefit pension obligation related to certain defined benefit plans and recorded a revision of its estimate of prior service cost of approximately $24.4 million. During the nine months ended September 30, 2022, the Company made approximately $26.3 million of contributions to its defined pension benefit plans. The Company currently estimates its minimum contributions for 2022 to its defined pension benefit plans will aggregate approximately $34.2 million. During the nine months ended September 30, 2022, the Company made approximately $1.2 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 2022.

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