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Employee Benefit Plans | 6 Months Ended
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Jun. 30, 2018
Retirement Benefits [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, 2018 and 2017 are set forth below (in millions):
|  | Three Months Ended June 30,
Pension benefits |  | 2018 |  | 2017
Service cost |  | $ | 4.8 |  |  | $ | 4.4 |
Interest cost |  | 5.1 |  |  | 5.2 |
Expected return on plan assets |  | (9.3 | ) |  | (9.1 | )
Amortization of net actuarial losses |  | 3.1 |  |  | 3.1 |
Amortization of prior service cost |  | 0.3 |  |  | 0.3 |
Net periodic pension cost |  | $ | 4.0 |  |  | $ | 3.9 |
|  | Three Months Ended June 30,
Postretirement benefits |  | 2018 |  | 2017
Service cost |  | $ | 0.1 |  |  | $ | 0.1 |
Interest cost |  | 0.3 |  |  | 0.4 |
Amortization of net actuarial losses |  | 0.1 |  |  | — |
Net periodic postretirement benefit cost |  | $ | 0.5 |  |  | $ | 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, 2018 and 2017 are set forth below (in millions):
|  | Six Months Ended June 30,
Pension benefits |  | 2018 |  | 2017
Service cost |  | $ | 9.7 |  |  | $ | 8.6 |
Interest cost |  | 10.2 |  |  | 10.2 |
Expected return on plan assets |  | (18.7 | ) |  | (17.8 | )
Amortization of net actuarial losses |  | 6.2 |  |  | 6.1 |
Amortization of prior service cost |  | 0.6 |  |  | 0.6 |
Net periodic pension cost |  | $ | 8.0 |  |  | $ | 7.7 |
|  | Six Months Ended June 30,
Postretirement benefits |  | 2018 |  | 2017
Service cost |  | $ | 0.1 |  |  | $ | 0.1 |
Interest cost |  | 0.7 |  |  | 0.8 |
Amortization of net actuarial losses |  | 0.1 |  |  | — |
Amortization of prior service cost |  | 0.1 |  |  | 0.1 |
Net periodic postretirement benefit cost |  | $ | 1.0 |  |  | $ | 1.0 |
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. Refer to Note 1 for further information. 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, 2018 (in millions):
|  | Before-Tax Amount |  | Income Tax |  | After-Tax Amount
Accumulated other comprehensive loss as of December 31, 2017 |  | $ | (380.6 | ) |  | $ | (95.5 | ) |  | $ | (285.1 | )
Amortization of net actuarial losses |  | 6.3 |  |  | 0.9 |  |  | 5.4 |
Amortization of prior service cost |  | 0.7 |  |  | — |  |  | 0.7 |
Accumulated other comprehensive loss as of June 30, 2018 |  | $ | (373.6 | ) |  | $ | (94.6 | ) |  | $ | (279.0 | )
During the six months ended June 30, 2018, approximately $17.2 million of contributions had been made to the Company’s defined pension benefit plans. The Company currently estimates its minimum contributions for 2018 to its defined pension benefit plans will aggregate approximately $32.9 million. During the six months ended June 30, 2018, the Company made approximately $0.7 million of contributions to its postretirement health care and life insurance benefit plans. The Company currently estimates that it will make approximately $1.6 million of contributions to its postretirement health care and life insurance benefit plans during 2018.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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