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POSTRETIREMENT BENEFIT PLANS (Tables) | 9 Months Ended
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Sep. 30, 2020
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 and nine months ended September 30, 2020 and 2019.
| 2020 |  | 2019
For the Three Months Ended September 30 | Pension |  | Other Benefits |  | Total |  | Pension |  | Other Benefits |  | Total
Service cost |  | $ | 0.4 |  |  |  |  | $ | 0.2 |  |  |  |  | $ | 0.6 |  |  |  |  | $ | 0.4 |  |  |  |  | $ | 0.2 |  |  |  |  | $ | 0.6 |  |
Interest cost |  | 2.2 |  |  |  |  | 0.8 |  |  |  |  | 3.0 |  |  |  |  | 3.1 |  |  |  |  | 1.0 |  |  |  |  | 4.1 |  |
Expected return on plan assets |  | (2.2) |  |  |  |  | — |  |  |  |  | (2.2) |  |  |  |  | (3.8) |  |  |  |  | (0.1) |  |  |  |  | (3.9) |  |
Amortization of prior service (benefit) cost |  | — |  |  |  |  | (1.3) |  |  |  |  | (1.3) |  |  |  |  | 0.2 |  |  |  |  | (1.3) |  |  |  |  | (1.1) |  |
Amortization of net actuarial loss |  | 1.8 |  |  |  |  | 0.6 |  |  |  |  | 2.4 |  |  |  |  | 1.3 |  |  |  |  | 0.6 |  |  |  |  | 1.9 |  |
Total net periodic benefit cost |  | $ | 2.2 |  |  |  |  | $ | 0.3 |  |  |  |  | $ | 2.5 |  |  |  |  | $ | 1.2 |  |  |  |  | $ | 0.4 |  |  |  |  | $ | 1.6 |  |
| 2020 |  | 2019
For the Nine Months Ended September 30 | Pension |  | Other Benefits |  | Total |  | Pension |  | Other Benefits |  | Total
Service cost |  | $ | 1.0 |  |  |  |  | $ | 0.6 |  |  |  |  | $ | 1.6 |  |  |  |  | $ | 1.1 |  |  |  |  | $ | 0.5 |  |  |  |  | $ | 1.6 |  |
Interest cost |  | 6.8 |  |  |  |  | 2.2 |  |  |  |  | 9.0 |  |  |  |  | 9.4 |  |  |  |  | 3.0 |  |  |  |  | 12.4 |  |
Expected return on plan assets |  | (6.5) |  |  |  |  | — |  |  |  |  | (6.5) |  |  |  |  | (11.0) |  |  |  |  | (0.1) |  |  |  |  | (11.1) |  |
Amortization of prior service (benefit) cost |  | — |  |  |  |  | (3.8) |  |  |  |  | (3.8) |  |  |  |  | 0.6 |  |  |  |  | (3.9) |  |  |  |  | (3.3) |  |
Amortization of net actuarial loss |  | 5.3 |  |  |  |  | 2.0 |  |  |  |  | 7.3 |  |  |  |  | 3.9 |  |  |  |  | 1.7 |  |  |  |  | 5.6 |  |
Total net periodic benefit cost |  | $ | 6.6 |  |  |  |  | $ | 1.0 |  |  |  |  | $ | 7.6 |  |  |  |  | $ | 4.0 |  |  |  |  | $ | 1.2 |  |  |  |  | $ | 5.2 |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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