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Share-Based Compensation | 6 Months Ended
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Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Share-Based Compensation | Share-Based Compensation The following table presents share-based compensation expense:
| For the Three Months Ended June 30, |  | For the Six Months Ended June 30,
| 2017 |  | 2018 |  | 2017 |  | 2018
Share-based compensation | $ | 10.3 |  |  | $ | 11.1 |  |  | $ | 19.7 |  |  | $ | 21.8 |
Tax benefit | 4.0 |  |  | 2.8 |  |  | 7.6 |  |  | 5.5 |
As of December 31, 2017, the Company had unrecognized share-based compensation expense of $63.5 million. As of June 30, 2018, the Company had unrecognized share-based compensation expense of $77.7 million, which will be recognized over a weighted average period of approximately two years (assuming no forfeitures). Stock Options The following table summarizes transactions in the Company’s stock options:
| Stock Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (years)
Unexercised options outstanding - December 31, 2017 | 0.6 |  |  | $ | 122.04 |  |  |
Options granted | 0.0 |  |  | 203.22 |  |  |
Options exercised | (0.0 | ) |  | 97.14 |  |  |
Options forfeited | (0.0 | ) |  | 122.40 |  |  |
Unexercised options outstanding - June 30, 2018 | 0.6 |  |  | 125.16 |  |  | 3.6
Exercisable at June 30, 2018 | 0.2 |  |  | 121.63 |  |  | 1.8
For the six months ended June 30, 2017 and 2018, the Company granted stock options with fair values of $0.4 million and $0.5 million, 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 fair value of options granted was estimated using the Black-Scholes option pricing model and were $46.49 and $53.81, per option, for the six months ended June 30, 2017 and 2018, respectively. The weighted average grant date assumptions used to estimate the fair value of options granted were as follows:
|  | For the Six Months Ended June 30,
|  | 2017 |  | 2018
Dividend yield |  | 0.5 | % |  | 0.7 | %
Expected volatility |  | 30.1 | % |  | 24.6 | %
Risk-free interest rate |  | 2.2 | % |  | 2.6 | %
Expected life of options (in years) |  | 5.7 |  |  | 5.7 |
Forfeiture rate |  | — | % |  | — | %
Restricted Stock The following table summarizes transactions in the Company’s restricted stock units:
| Restricted Stock Units |  | Weighted Average Grant Date Value
Unvested units - December 31, 2017 | 0.4 |  |  | $ | 162.32 |
Units granted | 0.2 |  |  | 203.23 |
Units vested | (0.0 | ) |  | 202.35 |
Units forfeited | (0.0 | ) |  | 152.09 |
Unvested units - June 30, 2018 | 0.6 |  |  | 172.73 |
For the six months ended June 30, 2017 and 2018, the Company granted awards with fair values of $36.4 million and $36.7 million, respectively. These awards were valued based on the closing price of the Company’s common stock on the grant date and the number of awards expected to be delivered. Awards containing vesting conditions generally require service over a period of three to four years and may also require the satisfaction of certain performance conditions.

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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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