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Common Equity (Tables) | 12 Months Ended
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Dec. 31, 2016
Stockholders' Equity Note [Abstract] |
Schedule of stock-based compensation expense and related deferred tax benefit recognized in income | The following table summarizes our pre-tax stock-based compensation expense and the related tax benefit for the years ended December 31:
(in millions) |  | 2016 |  | 2015 |  | 2014
Stock options |  | $ | 3.5 |  |  | $ | 3.3 |  |  | $ | 3.7 |
Restricted stock |  | 5.8 |  |  | 7.0 |  |  | 2.8 |
Performance units |  | 8.7 |  |  | 13.0 |  |  | 15.4 |
Stock-based compensation expense |  | $ | 18.0 |  |  | $ | 23.3 |  |  | $ | 21.9 |
Related tax benefit |  | $ | 7.2 |  |  | $ | 9.3 |  |  | $ | 8.8 |
Schedule of stock option activity | The following is a summary of our stock option activity during 2016:
Stock Options |  | Number of Options |  | Weighted-Average Exercise Price |  | Weighted-Average Remaining Contractual Life (in years) |  | Aggregate Intrinsic Value (in millions)
Outstanding as of January 1, 2016 |  | 5,984,664 |  |  | $ | 33.47 |  |  |  |  |
Granted |  | 794,764 |  |  | $ | 52.15 |  |  |  |  |
Exercised |  | (1,644,353 | ) |  | $ | 25.30 |  |  |  |  |
Forfeited |  | (12,300 | ) |  | $ | 52.98 |  |  |  |  |
Outstanding as of December 31, 2016 |  | 5,122,775 |  |  | $ | 38.95 |  |  | 6.0 |  | $ | 100.9 |
Exercisable as of December 31, 2016 |  | 3,710,836 |  |  | $ | 35.38 |  |  | 5.2 |  | $ | 86.4 |
Schedule of restricted stock activity | The following restricted stock activity occurred during 2016:
Restricted Shares |  | Number of Shares |  | Weighted-Average Grant Date Fair Value
Outstanding as of January 1, 2016 |  | 229,018 |  |  | $ | 46.78 |
Granted |  | 146,941 |  |  | $ | 53.69 |
Released |  | (141,224 | ) |  | $ | 46.14 |
Forfeited |  | (14,689 | ) |  | $ | 54.39 |
Outstanding as of December 31, 2016 |  | 220,046 |  |  | $ | 51.30 |
Schedule of shares repurchased | The following table identifies shares purchased during the year ended December 31:
|  | 2016 |  | 2015 |  | 2014
(in millions) |  | Shares |  | Cost |  | Shares |  | Cost |  | Shares |  | Cost
Under share repurchase programs |  | — |  |  | $ | — |  |  | — |  |  | $ | — |  |  | 0.4 |  |  | $ | 18.6 |
To fulfill exercised stock options and restricted stock awards |  | 1.8 |  |  | 108.0 |  |  | 1.5 |  |  | 74.7 |  |  | 2.3 |  |  | 104.6 |
Total |  | 1.8 |  |  | $ | 108.0 |  |  | 1.5 |  |  | $ | 74.7 |  |  | $ | 2.7 |  |  | $ | 123.2 |
Schedule of dividends declared | During the year ended December 31, 2016, our Board of Directors declared common stock dividends which are summarized below:
Date Declared |  | Date Payable |  | Per Share |  | Period
January 21, 2016 |  | March 1, 2016 |  | $0.4950 |  | First quarter
April 21, 2016 |  | June 1, 2016 |  | $0.4950 |  | Second quarter
July 21, 2016 |  | September 1, 2016 |  | $0.4950 |  | Third quarter
October 20, 2016 |  | December 1, 2016 |  | $0.4950 |  | Fourth quarter

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