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Pension and Postretirement Health and Life Benefits (Tables) | 9 Months Ended
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Sep. 30, 2014
General Discussion of Pension and Other Postretirement Benefits [Abstract] |
Schedule of Net Benefit Costs |
| Predecessor
| Defined Benefit Pension Plans |  | Postretirement Health and Life Benefit Plans
| Three Months Ended September 30, |  | Nine Months Ended September 30, |  | Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2014 |  | 2013 |  | 2014 |  | 2013 |  | 2014 |  | 2013 |  | 2014 |  | 2013
Service costs | $ | 0.6 |  |  | $ | 1.4 |  |  | $ | 1.8 |  |  | $ | 8.8 |  |  | $ | 0.4 |  |  | $ | 0.9 |  |  | $ | 1.3 |  |  | $ | 2.7 |
Interest costs | 10.6 |  |  | 11.5 |  |  | 31.7 |  |  | 33.5 |  |  | 2.5 |  |  | 2.2 |  |  | 7.5 |  |  | 6.7 |
Expected returns on plan assets (gains) | (12.9 | ) |  | (12.8 | ) |  | (38.5 | ) |  | (38.3 | ) |  | (0.5 | ) |  | (0.5 | ) |  | (1.5 | ) |  | (1.7 | )
Amortization of actuarial (gains) losses, net | 0.4 |  |  | 2.0 |  |  | 1.0 |  |  | 14.2 |  |  | — |  |  | 0.6 |  |  | — |  |  | 2.0 |
Amortization of prior service costs (credits) | — |  |  | — |  |  | — |  |  | 0.7 |  |  | (0.1 | ) |  | — |  |  | (0.3 | ) |  | — |
Curtailment (gains) | (2.2 | ) |  | — |  |  | (2.2 | ) |  | (0.7 | ) |  | — |  |  | — |  |  | — |  |  | — |
Net benefit costs (credits) | $ | (3.5 | ) |  | $ | 2.1 |  |  | $ | (6.2 | ) |  | $ | 18.2 |  |  | $ | 2.3 |  |  | $ | 3.2 |  |  | $ | 7.0 |  |  | $ | 9.7 |

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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=35743120&loc=d3e1928-114920 + Details
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