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EMPLOYEE RETIREMENT PLANS (Tables) | 6 Months Ended
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Jun. 30, 2015
EMPLOYEE RETIREMENT PLANS |
Schedule of components of net periodic benefit income |
|  | Pensions Three Months Ended June 30, |  | OPEB Benefits Three Months Ended June 30, |
(In millions) |  | 2015 |  | 2014 |  | 2015 |  | 2014 |
Components of net periodic benefit income: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Interest cost |  | $ | (7.7 | ) | $ | (7.9 | ) | $ | (1.1 | ) | $ | (1.1 | )
Service cost |  | ​ | (1.1 | ) | ​ | (0.9 | ) | ​ | (0.2 | ) | ​ | (0.2 | )
Expected return on assets |  |  | 11.4 |  |  | 11.8 |  |  | - |  |  | - |
Amortization of: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Prior service credit |  |  | - |  |  | - |  |  | 2.3 |  |  | 2.2 |
Actuarial gain (loss) |  | ​ | (0.7 | ) | ​ | 0.1 |  | ​ | - |  | ​ | - |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total net periodic benefit income |  | $ | 1.9 |  | $ | 3.1 |  | $ | 1.0 |  | $ | 0.9 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  | Pensions Six Months Ended June 30, |  | OPEB Benefits Six Months Ended June 30, |
(In millions) |  | 2015 |  | 2014 |  | 2015 |  | 2014 |
Components of net periodic benefit income: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Interest cost |  | $ | (15.4 | ) | $ | (15.8 | ) | $ | (2.2 | ) | $ | (2.2 | )
Service cost |  | ​ | (2.2 | ) | ​ | (1.8 | ) | ​ | (0.4 | ) | ​ | (0.4 | )
Expected return on assets |  |  | 22.8 |  |  | 23.6 |  |  | - |  |  | - |
Amortization of: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Prior service credit |  |  | - |  |  | - |  |  | 4.6 |  |  | 4.6 |
Actuarial gain (loss) |  | ​ | (1.4 | ) | ​ | 0.2 |  | ​ | - |  | ​ | - |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total net periodic benefit income |  | $ | 3.8 |  | $ | 6.2 |  | $ | 2.0 |  | $ | 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=35743120&loc=d3e1928-114920 + Details
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