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Share-Based Compensation | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Share-Based Compensation | Share-Based Compensation Share-Based Incentive Plans The Company has established various plans under which it is authorized to grant restricted stock, restricted stock units, stock options and stock appreciation rights. The Company may also grant cash awards that can be notionally invested in one or more specified measurement funds, including the Company’s common stock. Awards granted under the Company’s share-based incentive plans typically participate in any dividends declared, but such amounts are deferred until delivery of the shares and are forfeitable if the requisite service is not satisfied. Dividends may be paid in cash or may be reinvested in the Company’s common stock. The total fair value of share-based compensation awards that vested was $27.4 million, $20.7 million and $59.4 million during the years ended December 31, 2015, 2016 and 2017, respectively. Share-Based Incentive Compensation The following is a summary of share-based compensation expense for the years ended December 31, 2015, 2016 and 2017:
Year |  | Share-Based Compensation Expense |  | Tax Benefit
2015 |  | $ | 34.2 |  |  | $ | 13.2 |
2016 |  | 39.2 |  |  | 15.1 |
2017 |  | 40.4 |  |  | 13.6 |
The excess tax benefit recognized from share-based incentive plans was $5.1 million and $10.9 million during the years ended December 31, 2016 and 2017, respectively, and classified as an operating cash flow. The Company had $66.4 million and $63.5 million of unrecognized share-based compensation as of December 31, 2016 and 2017, respectively, which will be recognized over a weighted average period of approximately two years (assuming no forfeitures). Stock Options The following table summarizes the transactions of the Company’s stock options:
| Stock Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (years)
Unexercised options outstanding—January 1, 2017 | 1.4 |  |  | $ | 108.53 |  |  |
Options granted | 0.0 |  |  | 168.60 |  |  |
Options exercised | (0.7 | ) |  | 97.54 |  |  |
Options forfeited | (0.1 | ) |  | 140.26 |  |  |
Unexercised options outstanding—December 31, 2017 | 0.6 |  |  | 122.04 |  |  | 3.9
Exercisable at December 31, 2017 | 0.2 |  |  | 115.74 |  |  | 1.7
The Company granted stock options with fair values of $1.0 million, $16.4 million and $0.8 million in 2015, 2016 and 2017, respectively. Stock options generally vest over a period of three to four years and expire seven years after the grant date. All options have been granted with exercise prices equal to the closing price of the Company’s common stock on the grant date. In certain circumstances, option awards also require certain performance conditions to be satisfied in order for the options to be exercised. The Company generally uses treasury stock to settle stock option exercises. The total intrinsic value of options exercised during the years ended December 31, 2015, 2016 and 2017 was $130.2 million, $27.7 million and $50.8 million, respectively. The cash received for options exercised was $25.6 million and $41.9 million during the years ended December 31, 2016 and 2017, respectively. As of December 31, 2017, the intrinsic value of exercisable options outstanding was $20.1 million, and 3.1 million options were available for grant under the Company’s option plans. The fair value of options granted was estimated using the Black-Scholes option pricing model. The weighted average fair value of options granted during the years ended December 31, 2015, 2016 and 2017 was $54.92, $39.02 and $48.05, per option, respectively, based on the weighted-average grant date assumptions stated below.
| For the Years Ended December 31,
| 2015 |  | 2016 |  | 2017
Dividend yield | 0.0 | % |  | 0.0 | % |  | 0.5 | %
Expected volatility(1) | 26.7 | % |  | 30.7 | % |  | 28.0 | %
Risk-free interest rate(2) | 1.5 | % |  | 1.6 | % |  | 2.1 | %
Expected life of options (in years)(3) | 5.0 |  |  | 5.7 |  |  | 5.7 |
Forfeiture rate | 0.0 | % |  | 0.0 | % |  | 0.0 | %
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(1) | Expected volatility is based on historical and implied volatility.
(2) | Risk-free interest rate is based on the U.S. Treasury yield curve in effect at the date of grant.
(3) | Expected life of options (in years) is based on the Company’s historical and expected exercise behavior.
Restricted Stock The following table summarizes the transactions of the Company’s restricted stock:
| Restricted Stock |  | Weighted Average Grant Date Value
Unvested units—January 1, 2017 | 0.6 |  |  | $ | 168.84 |
Units granted | 0.2 |  |  | 152.99 |
Units vested | (0.4 | ) |  | 166.22 |
Units forfeited | (0.0 | ) |  | 170.39 |
Unvested units—December 31, 2017 | 0.4 |  |  | 162.32 |
The Company granted awards with fair values of $50.7 million, $28.0 million and $36.9 million in 2015, 2016 and 2017, respectively. These awards were valued based on the closing price of the Company’s common stock on the grant date and contain vesting conditions requiring service over a period of three to four years. In certain circumstances, awards also require certain performance conditions to be satisfied. As of December 31, 2017, the Company had 1.1 million shares available for grant under its plans.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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