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Employee Benefit Plans | 6 Months Ended
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Jun. 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 June 30, 2015 and 2014 are set forth below (in millions):
|  | Three Months Ended June 30,
Pension benefits |  | 2015 |  | 2014
Service cost |  | $ | 4.6 |  |  | $ | 4.3 |
Interest cost |  | 7.8 |  |  | 9.4 |
Expected return on plan assets |  | (11.1 | ) |  | (11.2 | )
Amortization of net actuarial loss |  | 2.8 |  |  | 2.2 |
Amortization of prior service cost |  | 0.1 |  |  | 0.2 |
Net periodic pension cost |  | $ | 4.2 |  |  | $ | 4.9 |
|  | Three Months Ended June 30,
Postretirement benefits |  | 2015 |  | 2014
Interest cost |  | $ | 0.3 |  |  | $ | 0.4 |
Amortization of prior service cost |  | 0.1 |  |  | 0.1 |
Net periodic postretirement benefit cost |  | $ | 0.4 |  |  | $ | 0.5 |
Net periodic pension and postretirement benefit cost for the Company’s defined pension and postretirement benefit plans for the six months ended June 30, 2015 and 2014 are set forth below (in millions):
|  | Six Months Ended June 30,
Pension benefits |  | 2015 |  | 2014
Service cost |  | $ | 9.3 |  |  | $ | 8.6 |
Interest cost |  | 15.6 |  |  | 18.8 |
Expected return on plan assets |  | (22.2 | ) |  | (22.4 | )
Amortization of net actuarial loss |  | 5.6 |  |  | 4.4 |
Amortization of prior service cost |  | 0.2 |  |  | 0.4 |
Net periodic pension cost |  | $ | 8.5 |  |  | $ | 9.8 |
|  | Six Months Ended June 30,
Postretirement benefits |  | 2015 |  | 2014
Service cost |  | $ | — |  |  | $ | 0.1 |
Interest cost |  | 0.7 |  |  | 0.8 |
Amortization of prior service cost |  | 0.1 |  |  | 0.1 |
Net periodic postretirement benefit cost |  | $ | 0.8 |  |  | $ | 1.0 |
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, 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 |  | 5.6 |  |  | 1.4 |  |  | 4.2 |
Amortization of prior service cost |  | 0.3 |  |  | 0.1 |  |  | 0.2 |
Accumulated other comprehensive loss as of June 30, 2015 |  | $ | (335.6 | ) |  | $ | (86.7 | ) |  | $ | (248.9 | )
During the six months ended June 30, 2015, approximately $19.8 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 $36.9 million. During the six months ended June 30, 2015, the Company made approximately $0.8 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.

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