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Common Equity (Tables) | 12 Months Ended
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Dec. 31, 2018
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) |  | 2018 |  | 2017 |  | 2016
Stock options |  | $ | 5.2 |  |  | $ | 3.4 |  |  | $ | 3.5 |
Restricted stock |  | 10.7 |  |  | 5.4 |  |  | 5.8 |
Performance units |  | 20.2 |  |  | 20.2 |  |  | 8.7 |
Stock-based compensation expense |  | $ | 36.1 |  |  | $ | 29.0 |  |  | $ | 18.0 |
Related tax benefit |  | $ | 9.9 |  |  | $ | 11.6 |  |  | $ | 7.2 |
Schedule of stock option activity | The following is a summary of our stock option activity during 2018:
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, 2018 |  | 4,644,214 |  |  | $ | 43.11 |  |  |  |  |
Granted |  | 710,710 |  |  | $ | 65.59 |  |  |  |  |
Exercised |  | (899,391 | ) |  | $ | 32.39 |  |  |  |  |
Forfeited |  | (3,000 | ) |  | $ | 57.99 |  |  |  |  |
Outstanding as of December 31, 2018 |  | 4,452,533 |  |  | $ | 48.86 |  |  | 6.1 |  | $ | 90.8 |
Exercisable as of December 31, 2018 |  | 2,838,609 |  |  | $ | 42.77 |  |  | 4.9 |  | $ | 75.2 |
Schedule of restricted stock activity | The following restricted stock activity occurred during 2018:
Restricted Shares |  | Number of Shares |  | Weighted-Average Grant Date Fair Value
Outstanding and unvested as of January 1, 2018 |  | 204,488 |  |  | $ | 54.94 |
Granted |  | 156,340 |  |  | $ | 64.20 |
Released |  | (121,060 | ) |  | $ | 54.97 |
Forfeited |  | (5,141 | ) |  | $ | 58.68 |
Outstanding and unvested as of December 31, 2018 |  | 234,627 |  |  | $ | 61.01 |
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) |  | 2018 |  | 2017 |  | 2016
Shares purchased |  | 1.1 |  |  | 1.1 |  |  | 1.8 |
Cost of shares purchased |  | $ | 72.4 |  |  | $ | 71.3 |  |  | $ | 108.0 |
Schedule of dividends declared | During the year ended December 31, 2018, our Board of Directors declared common stock dividends which are summarized below:
Date Declared |  | Date Payable |  | Per Share |  | Period
January 18, 2018 |  | March 1, 2018 |  | $0.5525 |  | First quarter
April 19, 2018 |  | June 1, 2018 |  | $0.5525 |  | Second quarter
July 19, 2018 |  | September 1, 2018 |  | $0.5525 |  | Third quarter
October 18, 2018 |  | December 1, 2018 |  | $0.5525 |  | Fourth quarter

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