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Common Equity | 12 Months Ended
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Dec. 31, 2017
Stockholders' Equity Note [Abstract] |
COMMON EQUITY | Stock-Based Compensation Plans 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 |
Stock-based compensation costs capitalized during 2017, 2016, and 2015 were not significant. Stock Options 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 |
The aggregate intrinsic value of outstanding and exercisable options in the above table represents the total pre-tax intrinsic value that would have been received by the option holders had they exercised all of their options on December 31, 2017. This is calculated as the difference between our closing stock price on December 31, 2017, and the option exercise price, multiplied by the number of in-the-money stock options. The intrinsic value of options exercised during the years ended December 31, 2017, 2016, and 2015 was $33.8 million, $55.4 million, and $36.1 million, respectively. The actual tax benefit from option exercises for the same periods was approximately $13.5 million, $22.2 million, and $14.5 million, respectively. As of December 31, 2017, approximately $2.7 million of unrecognized compensation cost related to unvested and outstanding stock options was expected to be recognized over the next 1.7 years on a weighted-average basis. During the first quarter of 2018, the Compensation Committee awarded 660,655 non-qualified stock options with a weighted-average exercise price of $66.02 and a weighted-average grant date fair value of $7.84 per option to certain of our officers and other key employees under its normal schedule of awarding long-term incentive compensation. Restricted Shares 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 |
The intrinsic value of restricted stock released was $5.4 million, $7.7 million, and $3.7 million for the years ended December 31, 2017, 2016, and 2015, respectively. The actual tax benefit from released restricted shares for the same years was $2.1 million, $3.1 million, and $1.3 million, respectively. As of December 31, 2017, approximately $4.1 million of unrecognized compensation cost related to restricted stock was expected to be recognized over the next 1.5 years on a weighted-average basis. During the first quarter of 2018, the Compensation Committee awarded 131,731 restricted shares to certain of our directors, officers, and other key employees under its normal schedule of awarding long-term incentive compensation. The grant date fair value of these awards was $64.97 per share. Performance Units During 2017, 2016, and 2015, the Compensation Committee awarded 237,650; 297,305; and 195,365 performance units, respectively, to officers and other key employees under the WEC Energy Group Performance Unit Plan. Performance units with an intrinsic value of $6.7 million, $19.1 million, and $13.2 million were settled during 2017, 2016, and 2015, respectively. The actual tax benefit from the distribution of performance units for the same years was $2.1 million, $6.8 million, and $4.8 million, respectively. At December 31, 2017, we had 563,033 performance units outstanding, including dividend equivalents. A liability of $27.6 million was recorded on our balance sheet at December 31, 2017 related to these outstanding units. As of December 31, 2017, approximately $23.5 million of unrecognized compensation cost related to unvested and outstanding performance units was expected to be recognized over the next 1.4 years on a weighted-average basis. During the first quarter of 2018, we settled performance units with an intrinsic value of $7.8 million. The actual tax benefit from the distribution of these awards was $1.7 million. In January 2018, the Compensation Committee also awarded 217,560 performance units to certain of our officers and other key employees under its normal schedule of awarding long-term incentive compensation. Restrictions Our ability as a holding company to pay common stock dividends primarily depends on the availability of funds received from our utility subsidiaries and our non-utility subsidiary, We Power. Various financing arrangements and regulatory requirements impose certain restrictions on the ability of our subsidiaries to transfer funds to us in the form of cash dividends, loans, or advances. All of our utility subsidiaries, with the exception of UMERC and MGU, are prohibited from loaning funds to us, either directly or indirectly. In accordance with their most recent rate orders, WE, WG, and WPS may not pay common dividends above the test year forecasted amounts reflected in their respective rate cases, if it would cause their average common equity ratio, on a financial basis, to fall below their authorized levels of 51%, 49.5%, and 51%, respectively. A return of capital in excess of the test year amount can be paid by each company at the end of the year provided that their respective average common equity ratios do not fall below the authorized levels. WE may not pay common dividends to us under WE's Restated Articles of Incorporation if any dividends on its outstanding preferred stock have not been paid. In addition, pursuant to the terms of WE's 3.60% Serial Preferred Stock, WE's ability to declare common dividends would be limited to 75% or 50% of net income during a twelve month period if its common stock equity to total capitalization, as defined in the preferred stock designation, is less than 25% and 20%, respectively. NSG's long-term debt obligations contain provisions and covenants restricting the payment of cash dividends and the purchase or redemption of its capital stock. WEC Energy Group and Integrys have the option to defer interest payments on their junior subordinated notes, from time to time, for one or more periods of up to 10 consecutive years per period. During any period in which they defer interest payments, they may not declare or pay any dividends or distributions on, or redeem, repurchase or acquire, their respective common stock. See Note 11, Short-Term Debt and Lines of Credit, for discussion of certain financial covenants related to short-term debt obligations. As of December 31, 2017, restricted net assets of our consolidated subsidiaries totaled approximately $6.3 billion. Our equity in undistributed earnings of investees accounted for by the equity method were approximately $355 million. The total of these amounts exceeds 25% of our consolidated net assets as of December 31, 2017. We do not believe that these restrictions will materially affect our operations or limit any dividend payments in the foreseeable future. Share Purchases We have instructed our independent agents to purchase shares on the open market to fulfill obligations under various stock-based employee benefit and compensations plans and to provide shares to participants in our dividend reinvestment and stock purchase plan. As a result, no new shares of common stock were issued in 2017, 2016, or 2015, other than for the Integrys acquisition in 2015. See Note 2, Acquisitions, for more information. 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 |
Common Stock Dividends 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
On January 18, 2018, our Board of Directors declared a quarterly cash dividend of $0.5525 per share, which equates to an annual dividend of $2.21 per share. The dividend is payable on March 1, 2018, to shareholders of record on February 14, 2018. In addition, the Board of Directors affirmed our dividend policy that continues to target a dividend payout ratio of 65-70% of earnings.

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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