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Employee Benefit Plans | 9 Months Ended
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Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract] |
Employee Benefit Plans | EMPLOYEE BENEFIT PLANS Net periodic pension and postretirement benefit cost for the Company’s defined pension and postretirement benefit plans for the three months ended September 30, 2015 and 2014 are set forth below (in millions):
|  | Three Months Ended September 30,
Pension benefits |  | 2015 |  | 2014
Service cost |  | $ | 4.6 |  |  | $ | 4.3 |
Interest cost |  | 7.8 |  |  | 9.4 |
Expected return on plan assets |  | (11.2 | ) |  | (11.2 | )
Amortization of net actuarial loss |  | 2.8 |  |  | 2.1 |
Amortization of prior service cost |  | 0.1 |  |  | 0.2 |
Net periodic pension cost |  | $ | 4.1 |  |  | $ | 4.8 |
|  | Three Months Ended September 30,
Postretirement benefits |  | 2015 |  | 2014
Interest cost |  | $ | 0.3 |  |  | $ | 0.4 |
Amortization of net actuarial loss |  | 0.1 |  |  | 0.1 |
Amortization of prior service cost |  | — |  |  | 0.1 |
Net periodic postretirement benefit cost |  | $ | 0.4 |  |  | $ | 0.6 |
Net periodic pension and postretirement benefit cost for the Company’s defined pension and postretirement benefit plans for the nine months ended September 30, 2015 and 2014 are set forth below (in millions):
|  | Nine Months Ended September 30,
Pension benefits |  | 2015 |  | 2014
Service cost |  | $ | 13.9 |  |  | $ | 12.9 |
Interest cost |  | 23.4 |  |  | 28.2 |
Expected return on plan assets |  | (33.4 | ) |  | (33.6 | )
Amortization of net actuarial loss |  | 8.4 |  |  | 6.5 |
Amortization of prior service cost |  | 0.3 |  |  | 0.6 |
Net periodic pension cost |  | $ | 12.6 |  |  | $ | 14.6 |
|  | Nine Months Ended September 30,
Postretirement benefits |  | 2015 |  | 2014
Service cost |  | $ | — |  |  | $ | 0.1 |
Interest cost |  | 1.0 |  |  | 1.2 |
Amortization of net actuarial loss |  | 0.1 |  |  | 0.1 |
Amortization of prior service cost |  | 0.1 |  |  | 0.2 |
Net periodic postretirement benefit cost |  | $ | 1.2 |  |  | $ | 1.6 |
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, 2015 (in millions):
|  | Before-Tax Amount |  | Income Tax |  | After-Tax Amount
Accumulated other comprehensive loss as of December 31, 2014 |  | $ | (341.5 | ) |  | $ | (88.2 | ) |  | $ | (253.3 | )
Amortization of net actuarial loss |  | 8.5 |  |  | 2.1 |  |  | 6.4 |
Amortization of prior service cost |  | 0.4 |  |  | 0.1 |  |  | 0.3 |
Accumulated other comprehensive loss as of September 30, 2015 |  | $ | (332.6 | ) |  | $ | (86.0 | ) |  | $ | (246.6 | )
During the nine months ended September 30, 2015, approximately $28.2 million of contributions had been made to the Company’s defined pension benefit plans. The Company currently estimates its minimum contributions for 2015 to its defined pension benefit plans will aggregate approximately $36.4 million. During the nine months ended September 30, 2015, the Company made approximately $1.0 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 2015. In October 2015, the Company amended its Executive Nonqualified Pension Plan (“ENPP”) to (a) limit participation to only those individuals who were participants in the ENPP as of July 31, 2015, (b) add an additional benefit, commencing at the end of the current 15-year benefit period, providing each participant an annuity in an amount equal to the annual payment during that 15-year period (or an equivalent value if a joint and survivor annuity is selected by the participant), and (c) to make various other administrative changes. The new benefit generally will be available only to participants who retire on or after reaching normal retirement age and otherwise have a vested benefit under the plan.

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