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Pension and Postretirement Health and Life Benefits (Tables) | 3 Months Ended
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Mar. 31, 2016
General Discussion of Pension and Other Postretirement Benefits [Abstract] |
Schedule of Net Benefit Costs | The components of net periodic benefit cost (credit) for the pension plans were as follows (in millions):
| Three Months Ended March 31,
| 2016 |  | 2015
Service costs | $ | 0.9 |  |  | $ | 1.0 |
Interest costs | 8.9 |  |  | 9.3 |
Expected return on plan assets (gains) | (10.5 | ) |  | (12.2 | )
Net periodic benefit (credit) | $ | (0.7 | ) |  | $ | (1.9 | )
The components of net periodic benefit cost for the postretirement health and life benefit plans were as follows (in millions):
| Three Months Ended March 31,
| 2016 |  | 2015
Service costs | $ | — |  |  | $ | 0.1 |
Interest costs | 2.1 |  |  | 2.2 |
Expected return on plan assets (gains) | (0.1 | ) |  | (0.2 | )
Amortization of prior service (credits), net | (0.1 | ) |  | (0.1 | )
Net periodic benefit cost | $ | 1.9 |  |  | $ | 2.0 |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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