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POSTRETIREMENT BENEFIT PLANS (Tables) | 3 Months Ended
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Mar. 31, 2018
Retirement Benefits [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, 2018 and 2017.
| 2018 |  | 2017
For the Three Months Ended March 31 | Pension |  | Other Benefits |  | Total |  | Pension |  | Other Benefits |  | Total
Service cost |  | $ | 0.4 |  |  |  |  | $ | 0.2 |  |  |  |  | $ | 0.6 |  |  |  |  | $ | 0.6 |  |  |  |  | $ | 0.2 |  |  |  |  | $ | 0.8 |  |
Interest cost |  | 2.8 |  |  |  |  | 1.1 |  |  |  |  | 3.9 |  |  |  |  | 3.0 |  |  |  |  | 1.1 |  |  |  |  | 4.1 |  |
Expected return on plan assets(a) |  | (3.4 | ) |  |  |  | (0.1 | ) |  |  |  | (3.5 | ) |  |  |  | (3.8 | ) |  |  |  | (0.1 | ) |  |  |  | (3.9 | ) |
Amortization of prior service cost (benefit) |  | 0.2 |  |  |  |  | (1.3 | ) |  |  |  | (1.1 | ) |  |  |  | 0.2 |  |  |  |  | (1.4 | ) |  |  |  | (1.2 | ) |
Amortization of net actuarial loss |  | 1.5 |  |  |  |  | 1.1 |  |  |  |  | 2.6 |  |  |  |  | 1.7 |  |  |  |  | 1.1 |  |  |  |  | 2.8 |  |
Total net periodic benefit cost |  | $ | 1.5 |  |  |  |  | $ | 1.0 |  |  |  |  | $ | 2.5 |  |  |  |  | $ | 1.7 |  |  |  |  | $ | 0.9 |  |  |  |  | $ | 2.6 |  |
(a) | Includes plan administrative expenses of $0.9 and $0.8 for the three months ended March 31, 2018 and 2017, respectively. The prior year plan administrative expenses have been reclassified from the service cost component line to conform to the current year presentation.

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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=82843861&loc=d3e1928-114920 + Details
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