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PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Estimated Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Pension Plan [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Service cost | $ 4.6 | $ 4.7 | $ 12.9 | $ 14.0
Interest cost | 8.9 | 7.6 | 26.2 | 22.7
Expected return on plan assets | (13.7) | (15.0) | (41.0) | (45.0)
Prior service cost (credits) | 0.3 | 0.6 | 0.9 | 1.7
Net actuarial loss | 5.9 | 5.3 | 17.7 | 15.9
Net periodic benefit cost (credit) | 6.0 | 3.2 | 16.7 | 9.3
Other Postretirement Benefit Plans, Defined Benefit [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Service cost | 0.5 | 0.6 | 1.3 | 1.6
Interest cost | 2.3 | 2.1 | 7.0 | 6.2
Expected return on plan assets | (4.2) | (4.6) | (12.6) | (13.8)
Prior service cost (credits) | (0.5) | (0.7) | (1.5) | (2.2)
Net actuarial loss | 1.3 | 1.3 | 3.8 | 3.8
Net periodic benefit cost (credit) | $ (0.6) | $ (1.3) | $ (2.0) | $ (4.4)

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