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Pension and Other Postretirement Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract] |
Components Of Net Periodic Cost | The components of net periodic cost are as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in millions) | Pension Benefits |  | Other Postretirement Benefits |  | Pension Benefits |  | Other Postretirement Benefits
| 2015 |  | 2014 |  | 2015 |  | 2014 |  | 2015 |  | 2014 |  | 2015 |  | 2014
Service cost | $ | 1.4 |  |  | $ | 1.3 |  |  | $ | — |  |  | $ | — |  |  | $ | 4.0 |  |  | $ | 3.8 |  |  | $ | — |  |  | $ | 0.1 |
Interest cost | 9.5 |  |  | 10.2 |  |  | 0.1 |  |  | 0.1 |  |  | 28.6 |  |  | 30.7 |  |  | 0.3 |  |  | 0.3 |
Expected return on plan assets | (15.7 | ) |  | (15.7 | ) |  | — |  |  | — |  |  | (46.9 | ) |  | (47.1 | ) |  | — |  |  | — |
Amortization of prior service cost | (0.1 | ) |  | — |  |  | (0.1 | ) |  | (0.1 | ) |  | (0.2 | ) |  | 0.1 |  |  | (0.2 | ) |  | (0.2 | )
Amortization of net loss (gain) | 3.1 |  |  | 1.3 |  |  | — |  |  | — |  |  | 9.3 |  |  | 3.8 |  |  | (0.2 | ) |  | (0.1 | )
Curtailment gain * | (4.4 | ) |  | — |  |  | — |  |  | — |  |  | (4.4 | ) |  | — |  |  | — |  |  | — |
Net periodic cost | $ | (6.2 | ) |  | $ | (2.9 | ) |  | $ | — |  |  | $ | — |  |  | $ | (9.6 | ) |  | $ | (8.8 | ) |  | $ | (0.1 | ) |  | $ | — |

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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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