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PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Estimated Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Pension Plan [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Service cost | $ 4.2 | $ 4.6 | $ 8.3 | $ 9.3
Interest cost | 8.6 | 7.5 | 17.3 | 15.1
Expected return on plan assets | (13.7) | (15.0) | (27.3) | (30.0)
Prior service credits | 0.3 | 0.6 | 0.6 | 1.1
Net actuarial loss | 5.9 | 5.3 | 11.8 | 10.6
Net periodic benefit credit | 5.3 | 3.0 | 10.7 | 6.1
Other Postretirement Benefit Plans, Defined Benefit [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Service cost | 0.4 | 0.5 | 0.8 | 1.0
Interest cost | 2.4 | 2.0 | 4.7 | 4.1
Expected return on plan assets | (4.2) | (4.6) | (8.4) | (9.2)
Prior service credits | (0.5) | (0.7) | (1.0) | (1.5)
Net actuarial loss | 1.2 | 1.3 | 2.5 | 2.5
Net periodic benefit credit | $ (0.7) | $ (1.5) | $ (1.4) | $ (3.1)

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