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Retirement Benefits | 3 Months Ended
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Mar. 31, 2018
Retirement Benefits [Abstract] |
Retirement Benefits | The Company has defined contribution retirement plans or defined benefit pension plans covering substantially all employees. Company contributions to defined contribution retirement plans are generally based on a percentage of eligible pay or based on hours worked. Benefits under the defined benefit pension plans are generally based on years of service and/or final average pay. The Company funds the U.S. pension plans in accordance with the Employee Retirement Income Security Act of 1974, as amended, and the Internal Revenue Code. The Company also sponsors several postretirement plans covering certain collectively-bargained salaried and hourly employees. The plans provide health care and life insurance benefits for eligible retirees. In most retiree health care plans, Company contributions towards premiums are capped based on the cost as of a certain date, thereby creating a defined contribution. For the three month periods ended March 31, 2018 and 2017, the components of pension and other postretirement benefit expense for the Company’s defined benefit plans included the following (in millions):
| Pension Benefits |  | Other Postretirement Benefits
| Three months ended March 31, |  | Three months ended March 31,
| 2018 |  | 2017 |  | 2018 |  | 2017
Service cost - benefits earned during the year | $ | 4.2 |  |  | $ | 3.5 |  |  | $ | 0.6 |  |  | $ | 0.6 |
Interest cost on benefits earned in prior years | 26.1 |  |  | 29.2 |  |  | 3.1 |  |  | 3.7 |
Expected return on plan assets | (39.5 | ) |  | (36.7 | ) |  | — |  |  | — |
Amortization of prior service cost (credit) | 0.1 |  |  | 0.3 |  |  | (0.7 | ) |  | (0.7 | )
Amortization of net actuarial loss | 16.5 |  |  | 15.6 |  |  | 2.7 |  |  | 2.2 |
Total retirement benefit expense | $ | 7.4 |  |  | $ | 11.9 |  |  | $ | 5.7 |  |  | $ | 5.8 |
In March 2017, the Company made a $135 million cash contribution to the ATI Pension Plan, its U.S. qualified defined benefit pension plan, completing the Company’s funding requirements for 2017.

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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 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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