| **COMMON STOCK Stock Issuance (Details) - USD ($) $ / shares in Units, $ in Millions** | 12 Months Ended |
|----------------------------------------------------------------------------------------|-----------------|
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| September 2016 Common Stock Issuance [Member]                                          |            |   |
| **Class of Stock [Line Items]**                                                        |            |   |
| Stock Issued During Period, Shares, New Issues                                         | 9,085,000       |   |
| Sale of Stock, Price Per Share                                                         | $ 61.51         |   |
| Proceeds from Issuance of Common Stock                                                 | $ 558.5         |   |
| March 2016 Common Stock Issuance [Member]                                              |            |   |
| **Class of Stock [Line Items]**                                                        |            |   |
| Stock Issued During Period, Shares, New Issues                                         | 5,922,500       |   |
| Sale of Stock, Price Per Share                                                         | $ 50.11         |   |
| Proceeds from Issuance of Common Stock                                                 | $ 296.6         |   |
| March 2015 Common Stock Issuance                                                       |            |   |
| **Class of Stock [Line Items]**                                                        |            |   |
| Stock Issued During Period, Shares, New Issues                                         |            | 4,002,000 |
| Sale of Stock, Price Per Share                                                         |            | $ 50.73 |
| Proceeds from Issuance of Common Stock                                                 |            | $ 202.9 |

| X                                                                                                                                                                                                                                                                                                                                                                                                             |
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| - 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.
+ References
No definition available.
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| - Definition
The cash inflow from the additional capital contribution to the entity.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                 |
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| - Definition
Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of new stock issued during the period.
+ References
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| X                                                                                                                                                                     |
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| X                                                                                                                                                                 |
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| X                                                                                                                                                                 |
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