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COMMON EQUITY - ADOPTION OF ASU 2016-09 (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Changes in retained earnings [Roll Forward] |  |
Balance at December 31, 2016 | $ 4,613.9 |
Net income attributed to common shareholders | 356.6 | $ 346.2
Common stock dividends | (164.1) |
Cumulative effect of adoption of ASU 2016-09 | 15.7 |
Other | (0.1) |
Balance at March 31, 2017 | $ 4,822.0 |

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