COMMITMENTS AND CONTINGENCIES (Contingencies) (Details) $ in Millions, $ in Millions |
9 Months Ended | |||
|---|---|---|---|---|
|
Sep. 30, 2018
USD ($)
|
Sep. 30, 2018
CAD ($)
|
Jan. 01, 2018
USD ($)
|
Dec. 31, 2017
USD ($)
|
|
| Loss Contingencies [Line Items] | ||||
| Loans to and accounts receivable from the Canadian Entities | $ 0.0 | $ 51.6 | $ 51.6 | |
| Cash contribution | $ 19.0 | |||
| Michigan Electricity Matters [Member] | ||||
| Loss Contingencies [Line Items] | ||||
| Loss Contingency Accrual | 8.8 | $ 13.0 | ||
| Loss Contingency Accrual, Period Increase (Decrease) | $ 4.2 | |||
| X | ||||||||||
- Definition Cash Contribution No definition available.
|
| X | ||||||||||
- Definition Loans to and accounts receivables from the Canadian Entities No definition available.
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Definition Amount of loss contingency liability. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount of increase (decrease) in loss contingency liability. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Details
|