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Employee Benefit Plans | 3 Months Ended
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Mar. 31, 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 March 31, 2015 and 2014 are set forth below (in millions):
|  | Three Months Ended March 31,
Pension benefits |  | 2015 |  | 2014
Service cost |  | $ | 4.7 |  |  | $ | 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 |  | $ | 4.3 |  |  | $ | 4.9 |
|  | Three Months Ended March 31,
Postretirement benefits |  | 2015 |  | 2014
Service cost |  | $ | — |  |  | $ | 0.1 |
Interest cost |  | 0.4 |  |  | 0.4 |
Net periodic postretirement benefit cost |  | $ | 0.4 |  |  | $ | 0.5 |
The following table summarizes the activity in accumulated other comprehensive loss related to the Company’s defined pension and postretirement benefit plans during the three months ended March 31, 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 |  | 2.8 |  |  | 0.7 |  |  | 2.1 |
Amortization of prior service cost |  | 0.1 |  |  | — |  |  | 0.1 |
Accumulated other comprehensive loss as of March 31, 2015 |  | $ | (338.6 | ) |  | $ | (87.5 | ) |  | $ | (251.1 | )
During the three months ended March 31, 2015, approximately $8.5 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 $35.2 million. During the three months ended March 31, 2015, the Company made approximately $0.5 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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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2410-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49170332&loc=SL14450702-114947 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414199&loc=d3e39622-114963 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39675-114964 + Details
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