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COMMON EQUITY - ADOPTION OF ASU 2016-09 (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Changes in retained earnings [Roll Forward] |  |  |  |
Balance at December 31, 2016 |  |  | $ 4,613.9 |
Net income attributed to common shareholders | $ 199.1 | $ 181.4 | 555.7 | $ 527.6
Common stock dividends |  |  | (328.3) |
Cumulative effect of adoption of ASU 2016-09 | 15.7 |  | 15.7 |
Balance at June 30, 2017 | $ 4,857.0 |  | $ 4,857.0 |

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