v3.3.0.814

EMPLOYEE RETIREMENT PLANS (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2016 | Sep. 01, 2015 | Dec. 31, 2014
OPEB Benefits |  |  |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |  |  |
Changes in OPEB benefit obligation |  |  | $ (29.8) |  |  |  |
Discount rate |  |  |  |  |  | 3.59% | 3.90%
Increase (decrease) in service cost due to remeasurement |  |  | (0.2) |  |  |  |
Increase (decrease) in interest cost due to remeasurement |  |  | $ (0.2) |  |  |  |
Defined benefit plan weighted average rates, service cost |  |  | 3.59% |  |  |  |
Defined benefit plan weighted average rates, interest cost |  |  | 3.59% |  |  |  |
OPEB Benefits | Minimum |  |  |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |  |  |
Spot rate for service cost |  |  | 0.65% |  |  |  |
Spot rate for interest cost |  |  | 0.65% |  |  |  |
OPEB Benefits | Maximum |  |  |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |  |  |
Spot rate for service cost |  |  | 5.01% |  |  |  |
Spot rate for interest cost |  |  | 5.01% |  |  |  |
OPEB Benefits | Estimated |  |  |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |  |  |
Estimated increase (decrease) in service cost |  |  |  |  | $ (7.0) |  |
Estimated increase (decrease) in interest cost |  |  |  |  | $ (7.0) |  |
U.S. Pension Plans |  |  |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |  |  |
Expense related to the defined contribution plans | $ 3.6 | $ 3.4 | $ 10.9 | $ 10.8 |  |  |

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