PENSION PLANS AND RETIREMENT BENEFITS (Details 1) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2017 |
Sep. 30, 2016 |
Sep. 30, 2017 |
Sep. 30, 2016 |
|
| Pension Benefits | ||||
| Service Cost | $ 4.3 | $ 3.3 | $ 12.7 | $ 9.2 |
| Interest Cost | 21.8 | 21.8 | 65.0 | 66.0 |
| Expected return on plans' assets | (39.2) | (39.5) | (117.6) | (118.4) |
| Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | 0.0 | (0.1) | 0.0 | 0.0 |
| Recognized acturial loss | 6.8 | 5.2 | 20.2 | 15.5 |
| Net periodic benefit (income) cost | (6.3) | (9.3) | (19.7) | (27.7) |
| Other Postretirement Benefits | ||||
| Service Cost | 0.3 | 0.2 | 0.9 | 0.9 |
| Interest Cost | 0.3 | 0.3 | 1.1 | 1.2 |
| Expected return on plans' assets | 0.0 | 0.0 | 0.0 | 0.0 |
| Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | (0.6) | (2.0) | (1.9) | (2.0) |
| Recognized acturial loss | 0.6 | 0.2 | 1.9 | 1.8 |
| Net periodic benefit (income) cost | $ 0.6 | $ (1.3) | $ 2.0 | $ 1.9 |