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Common Equity (Tables) | 12 Months Ended
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Dec. 31, 2017
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 recognized in income for the years ended December 31:
(in millions) |  | 2017 |  | 2016 |  | 2015
Stock options |  | $ | 3.4 |  |  | $ | 3.5 |  |  | $ | 3.3 |
Restricted stock |  | 5.4 |  |  | 5.8 |  |  | 7.0 |
Performance units |  | 20.2 |  |  | 8.7 |  |  | 13.0 |
Stock-based compensation expense |  | $ | 29.0 |  |  | $ | 18.0 |  |  | $ | 23.3 |
Related tax benefit |  | $ | 11.6 |  |  | $ | 7.2 |  |  | $ | 9.3 |
Schedule of stock option activity | The following is a summary of our stock option activity during 2017:
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, 2017 |  | 5,122,775 |  |  | $ | 38.95 |  |  |  |  |
Granted |  | 552,215 |  |  | $ | 58.31 |  |  |  |  |
Exercised |  | (1,019,111 | ) |  | $ | 30.24 |  |  |  |  |
Forfeited |  | (11,665 | ) |  | $ | 56.48 |  |  |  |  |
Outstanding as of December 31, 2017 |  | 4,644,214 |  |  | $ | 43.11 |  |  | 6.0 |  | $ | 108.3 |
Exercisable as of December 31, 2017 |  | 3,275,850 |  |  | $ | 38.23 |  |  | 5.0 |  | $ | 92.4 |
Schedule of restricted stock activity | The following restricted stock activity occurred during 2017:
Restricted Shares |  | Number of Shares |  | Weighted-Average Grant Date Fair Value
Outstanding as of January 1, 2017 |  | 220,046 |  |  | $ | 51.30 |
Granted |  | 82,622 |  |  | $ | 58.10 |
Released |  | (91,147 | ) |  | $ | 48.98 |
Forfeited |  | (7,033 | ) |  | $ | 55.60 |
Outstanding as of December 31, 2017 |  | 204,488 |  |  | $ | 54.94 |
Schedule of shares repurchased | The following is a summary of shares purchased to fulfill exercised stock options and restricted stock awards during the years ended December 31:
(in millions) |  | 2017 |  | 2016 |  | 2015
Shares purchased |  | 1.1 |  |  | 1.8 |  |  | 1.5 |
Cost of shares purchased |  | $ | 71.3 |  |  | $ | 108.0 |  |  | $ | 74.7 |
Schedule of dividends declared | During the year ended December 31, 2017, our Board of Directors declared common stock dividends which are summarized below:
Date Declared |  | Date Payable |  | Per Share |  | Period
January 19, 2017 |  | March 1, 2017 |  | $0.52 |  | First quarter
April 20, 2017 |  | June 1, 2017 |  | $0.52 |  | Second quarter
July 20, 2017 |  | September 1, 2017 |  | $0.52 |  | Third quarter
October 19, 2017 |  | December 1, 2017 |  | $0.52 |  | Fourth quarter

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