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Share-Based Compensation
 3 Months Ended
Mar. 31, 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 March 31,
 
2014
 
2015
Share-based compensation
$
6.5

 
$
8.0

Tax benefit
2.5

 
3.1


There was $56.8 million and $95.9 million of unrecognized share-based compensation as of December 31, 2014 and March 31, 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

 
197.79

 
 
Options exercised
(0.7
)
 
65.72

 
 
Options forfeited
(0.0
)
 
101.29

 
 
Unexercised options outstanding—March 31, 2015
1.6

 
91.37

 
2.7
Exercisable at March 31, 2015
1.4

 
88.60

 
2.6

As of March 31, 2015, 0.1 million options outstanding have expiration dates prior to the end of 2015.
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

 
197.91

Units vested
(0.1
)
 
166.56

Units forfeited
(0.0
)
 
190.65

Unvested units—March 31, 2015
0.6

 
192.06



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 value 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 over a service period of four years.