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Pension and Postretirement Health and Life Benefits | 9 Months Ended
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Sep. 30, 2018
Retirement Benefits, Description [Abstract] |
Pension and Postretirement Health and Life Benefits | PENSION AND POSTRETIREMENT HEALTH AND LIFE BENEFITS The components of net periodic benefit expense (income) for the defined benefit pension plans are as follows (in millions):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Service costs | $ | 0.9 |  |  | $ | 0.9 |  |  | $ | 2.5 |  |  | $ | 2.8 |
Interest costs | 7.1 |  |  | 8.0 |  |  | 21.5 |  |  | 24.1 |
Expected gains on plan assets | (10.3 | ) |  | (10.1 | ) |  | (30.7 | ) |  | (30.5 | )
Net periodic benefit income | $ | (2.3 | ) |  | $ | (1.2 | ) |  | $ | (6.7 | ) |  | $ | (3.6 | )
The components of net periodic benefit expense for the postretirement health and life benefit plans are as follows (in millions):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Interest costs | $ | 1.5 |  |  | $ | 1.8 |  |  | $ | 4.4 |  |  | $ | 5.4 |
Amortization of prior service credits | — |  |  | — |  |  | (0.1 | ) |  | (0.1 | )
Net periodic benefit expense | $ | 1.5 |  |  | $ | 1.8 |  |  | $ | 4.3 |  |  | $ | 5.3 |
The Company reports service costs for its defined benefit pension plans and its postretirement health and life benefit plans in Cost of Sales and Selling, General and Administrative Expenses. The remaining components of net periodic benefit expense (income) are reported as Nonoperating Components of Net Periodic Benefit Expense (Income).

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- References No definition available. + Details
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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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