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Pension and Postretirement Health and Life Benefits | 9 Months Ended
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Sep. 30, 2017
Retirement Benefits, Description [Abstract] |
Pension and Postretirement Health and Life Benefits | PENSION AND POSTRETIREMENT HEALTH AND LIFE BENEFITS The components of net periodic benefit cost (credit) for the defined benefit pension plans were as follows (in millions):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Service costs | $ | 0.9 |  |  | $ | 1.0 |  |  | $ | 2.8 |  |  | $ | 2.9 |
Interest costs | 8.0 |  |  | 8.9 |  |  | 24.1 |  |  | 26.6 |
Expected gains on plan assets | (10.1 | ) |  | (10.6 | ) |  | (30.5 | ) |  | (31.6 | )
Actuarial loss from remeasurement | — |  |  | — |  |  | — |  |  | 0.8 |
Net periodic benefit credit | $ | (1.2 | ) |  | $ | (0.7 | ) |  | $ | (3.6 | ) |  | $ | (1.3 | )
In the second quarter of 2016, the level of lump-sum payments under the non-qualified defined benefit pension plans resulted in the remeasurement of pension obligations under settlement accounting rules. The remeasurement resulted in a loss of $0.8 million included in Selling, General and Administrative Expenses in the second quarter of 2016. The loss includes the effect of a decrease in the discount rate used in the remeasurement of pension obligations from approximately 4.5% as of December 31, 2015, to approximately 3.7% as of June 30, 2016. The components of net periodic benefit cost for the postretirement health and life benefit plans were as follows (in millions):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Interest costs | $ | 1.8 |  |  | $ | 2.1 |  |  | $ | 5.4 |  |  | $ | 6.1 |
Expected gains on plan assets | — |  |  | (0.1 | ) |  | — |  |  | (0.2 | )
Amortization of prior service credits, net | — |  |  | (0.1 | ) |  | (0.1 | ) |  | (0.2 | )
Net periodic benefit cost | $ | 1.8 |  |  | $ | 1.9 |  |  | $ | 5.3 |  |  | $ | 5.7 |

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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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