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Share-Based Compensation
 6 Months Ended
Jun. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share-Based Compensation
Share-Based Compensation
A summary of share-based compensation is as follows:
 
For the Three Months Ended June 30,
 
For the Six Months Ended June 30,
 
2014
 
2015
 
2014
 
2015
Share-based compensation
$
8.7

 
$
9.1

 
$
15.2

 
$
17.1

Tax benefit
3.4

 
3.5

 
5.8

 
6.6


There was $56.8 million and $86.3 million of unrecognized share-based compensation as of December 31, 2014 and June 30, 2015, respectively, which will be recognized over a weighted average period of approximately three 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—December 31, 2014
2.3

 
$
83.42

 
 
Options granted
0.0

 
199.86

 
 
Options exercised
(0.9
)
 
65.60

 
 
Options forfeited
(0.0
)
 
101.29

 
 
Unexercised options outstanding—June 30, 2015
1.4

 
94.29

 
2.5
Exercisable at June 30, 2015
1.3

 
91.76

 
2.4

Restricted Stock
The following table summarizes the transactions of the Company’s restricted stock units:

 
Restricted
Stock
 
Weighted
Average
Grant Date
Value
Unvested units—December 31, 2014
0.4

 
$
182.83

Units granted
0.3

 
197.93

Units vested
(0.2
)
 
174.19

Units forfeited
(0.0
)
 
190.76

Unvested units—June 30, 2015
0.5

 
192.10



Of the 0.3 million units granted in January 2015, 0.2 million contained service-based vesting conditions and the remaining 0.1 million vest if both a requisite service period and certain performance conditions have been satisfied. The fair values of the awards were based on the closing price of the Company’s common stock on the date of grant and will be recognized as compensation expense over a service period of four years.