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POSTRETIREMENT BENEFIT PLANS (Tables) | 3 Months Ended
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Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract] |
Net Periodic Benefit Cost of Pension Plans and Other Employee Related Benefit Plans | The following table provides the components of net periodic benefit cost for pension plans and other employee-related benefit plans for the three months ended March 31, 2015 and 2014.
| 2015 |  | 2014
Three Months Ended March 31 | Pension |  | Other Benefits |  | Total |  | Pension |  | Other Benefits |  | Total
Service cost |  | $ | 1.3 |  |  |  |  | $ | 0.2 |  |  |  |  | $ | 1.5 |  |  |  |  | $ | 1.2 |  |  |  |  | $ | 0.5 |  |  |  |  | $ | 1.7 |  |
Interest cost |  | 3.6 |  |  |  |  | 1.2 |  |  |  |  | 4.8 |  |  |  |  | 3.9 |  |  |  |  | 2.0 |  |  |  |  | 5.9 |  |
Expected return on plan assets |  | (5.1 | ) |  |  |  | (0.2 | ) |  |  |  | (5.3 | ) |  |  |  | (5.2 | ) |  |  |  | (0.2 | ) |  |  |  | (5.4 | ) |
Amortization of prior service cost (benefit) |  | 0.2 |  |  |  |  | (2.7 | ) |  |  |  | (2.5 | ) |  |  |  | 0.2 |  |  |  |  | (1.5 | ) |  |  |  | (1.3 | ) |
Amortization of net actuarial loss |  | 2.1 |  |  |  |  | 1.1 |  |  |  |  | 3.2 |  |  |  |  | 1.6 |  |  |  |  | 0.7 |  |  |  |  | 2.3 |  |
Total net periodic benefit cost |  | $ | 2.1 |  |  |  |  | $ | (0.4 | ) |  |  |  | $ | 1.7 |  |  |  |  | $ | 1.7 |  |  |  |  | $ | 1.5 |  |  |  |  | $ | 3.2 |  |

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- Definition Tabular disclosure of the amounts related to pension plans and/or other employee benefit plans in accumulated other comprehensive income or loss that have not yet been recognized as components of net periodic benefit cost, such as the net gain (loss), net prior service cost or credit, and net transition asset or obligation. + 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 (j) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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