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POSTRETIREMENT BENEFIT PLANS (Tables) | 6 Months Ended
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Jun. 30, 2016
Compensation and Retirement Disclosure [Abstract] |
Net Periodic Benefit Cost of Pension Plans and Other Employee Related Benefit Plans | The following tables provide the components of net periodic benefit cost for pension plans and other employee-related benefit plans for the three and six months ended June 30, 2016 and 2015.
| 2016 |  | 2015
For the Three Months Ended June 30 | Pension |  | Other Benefits |  | Total |  | Pension |  | Other Benefits |  | Total
Service cost |  | $ | 1.3 |  |  |  |  | $ | 0.2 |  |  |  |  | $ | 1.5 |  |  |  |  | $ | 1.3 |  |  |  |  | $ | 0.2 |  |  |  |  | $ | 1.5 |  |
Interest cost |  | 3.5 |  |  |  |  | 1.2 |  |  |  |  | 4.7 |  |  |  |  | 3.6 |  |  |  |  | 1.2 |  |  |  |  | 4.8 |  |
Expected return on plan assets |  | (5.1 | ) |  |  |  | (0.1 | ) |  |  |  | (5.2 | ) |  |  |  | (5.1 | ) |  |  |  | (0.2 | ) |  |  |  | (5.3 | ) |
Amortization of prior service cost (benefit) |  | 0.3 |  |  |  |  | (1.7 | ) |  |  |  | (1.4 | ) |  |  |  | 0.2 |  |  |  |  | (2.7 | ) |  |  |  | (2.5 | ) |
Amortization of net actuarial loss |  | 1.8 |  |  |  |  | 1.2 |  |  |  |  | 3.0 |  |  |  |  | 2.1 |  |  |  |  | 1.1 |  |  |  |  | 3.2 |  |
Total net periodic benefit cost (benefit) |  | $ | 1.8 |  |  |  |  | $ | 0.8 |  |  |  |  | $ | 2.6 |  |  |  |  | $ | 2.1 |  |  |  |  | $ | (0.4 | ) |  |  |  | $ | 1.7 |  |
| 2016 |  | 2015
For the Six Months Ended June 30 | Pension |  | Other Benefits |  | Total |  | Pension |  | Other Benefits |  | Total
Service cost |  | $ | 2.5 |  |  |  |  | $ | 0.4 |  |  |  |  | $ | 2.9 |  |  |  |  | $ | 2.6 |  |  |  |  | $ | 0.4 |  |  |  |  | $ | 3.0 |  |
Interest cost |  | 6.9 |  |  |  |  | 2.4 |  |  |  |  | 9.3 |  |  |  |  | 7.1 |  |  |  |  | 2.4 |  |  |  |  | 9.5 |  |
Expected return on plan assets |  | (10.1 | ) |  |  |  | (0.3 | ) |  |  |  | (10.4 | ) |  |  |  | (10.2 | ) |  |  |  | (0.4 | ) |  |  |  | (10.6 | ) |
Amortization of prior service cost (benefit) |  | 0.5 |  |  |  |  | (3.3 | ) |  |  |  | (2.8 | ) |  |  |  | 0.5 |  |  |  |  | (5.5 | ) |  |  |  | (5.0 | ) |
Amortization of net actuarial loss |  | 3.7 |  |  |  |  | 2.4 |  |  |  |  | 6.1 |  |  |  |  | 4.3 |  |  |  |  | 2.2 |  |  |  |  | 6.5 |  |
Total net periodic benefit cost (benefit) |  | $ | 3.5 |  |  |  |  | $ | 1.6 |  |  |  |  | $ | 5.1 |  |  |  |  | $ | 4.3 |  |  |  |  | $ | (0.9 | ) |  |  |  | $ | 3.4 |  |

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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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