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PENSIONS AND OTHER POSTRETIREMENT BENEFITS PENSION AND OTHER POSTRETIREMENT BENEFITS (Obligations and Funded Status) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions | $ 3.7 | $ 3.8 |
Non-current liabilities | (311.5) | (248.7) |
Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Benefit obligations - beginning of year | 905.7 | 973.1 |
Service cost (excluding expense) | 17.3 | 18.7 | $ 17.1
Interest cost | 34.9 | 30.3 | 30.5
Plan Amendments | 0.0 | 2.2 |
Actuarial (gain) loss | 111.8 | (57.0) |
Benefits paid | (62.2) | (60.7) |
Participant contributions | 0.0 | 0.0 |
Other | 13.6 | (0.9) |
Benefit obligations - end of year | 1,021.1 | 905.7 | 973.1
Fair value of plan assets — beginning of year | 687.2 | 749.8 |
Actual return on plan assets | 98.1 | (29.6) |
Participant contributions | 0.0 | 0.0 |
Employer contributions | 16.4 | 27.6 |
Benefits paid | (62.2) | (60.7) |
Other | 9.4 | 0.1 |
Fair value of plan assets — end of year | 748.9 | 687.2 | 749.8
Funded (Unfunded) Status | (272.2) | (218.5) |
Assets for Plan Benefits, Defined Benefit Plan | 0.0 | 0.0 |
Current liabilities | (0.5) | (0.1) |
Non-current liabilities | (271.7) | (218.4) |
Total amount recognized | (272.2) | (218.5) |
Net actuarial loss | 382.1 | 330.1 |
Prior service cost (credit) | 7.3 | 8.5 |
Net amount recognized | 389.4 | 338.6 |
Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Benefit obligations - beginning of year | 241.9 | 265.9 |
Service cost (excluding expense) | 1.7 | 2.2 | 1.8
Interest cost | 9.5 | 8.3 | 8.3
Plan Amendments | 0.0 | 12.8 |
Actuarial (gain) loss | 18.9 | (29.4) |
Benefits paid | (25.6) | (24.4) |
Participant contributions | 5.8 | 5.6 |
Other | 2.3 | 0.9 |
Benefit obligations - end of year | 254.5 | 241.9 | 265.9
Fair value of plan assets — beginning of year | 240.2 | 262.5 |
Actual return on plan assets | 35.1 | (8.2) |
Participant contributions | 0.5 | 0.5 |
Employer contributions | 2.5 | 3.0 |
Benefits paid | (18.6) | (17.6) |
Other | 0.0 | 0.0 |
Fair value of plan assets — end of year | 259.7 | 240.2 | $ 262.5
Funded (Unfunded) Status | 5.2 | (1.7) |
Assets for Plan Benefits, Defined Benefit Plan | 48.5 | 32.1 |
Current liabilities | (3.5) | (3.5) |
Non-current liabilities | (39.8) | (30.3) |
Total amount recognized | 5.2 | (1.7) |
Net actuarial loss | 72.6 | 82.1 |
Prior service cost (credit) | (7.9) | (9.9) |
Net amount recognized | $ 64.7 | $ 72.2 |

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