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COMMON EQUITY (Tables) | 3 Months Ended
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Mar. 31, 2017
Equity [Abstract] |
Schedule of stock-based compensation awards granted | During the first quarter of 2017, the Compensation Committee of our Board of Directors awarded the following stock-based compensation awards to our directors, officers, and certain other key employees:
Award Type |  | Number of Awards
Stock options (1) |  | 552,215 |
Restricted shares (2) |  | 82,622 |
Performance units |  | 237,650 |
(1) | Stock options awarded had a weighted-average exercise price of $58.31 and a weighted-average grant date fair value of $7.45 per option.
(2) | Restricted shares awarded had a weighted-average grant date fair value of $58.10 per share.
Retained earnings |
Schedule of changes to retained earnings |
Schedule of changes in retained earnings | The following table shows the changes to our retained earnings for the three months ended March 31, 2017:
(in millions) |  | Retained Earnings
Balance at December 31, 2016 |  | $ | 4,613.9 |
Net income attributed to common shareholders |  | 356.6 |
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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- Definition Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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