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Share-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Share-Based Compensation
A summary of share-based compensation is as follows:
 
For the Three Months Ended September 30,
 
For the Nine Months Ended September 30,
 
2013
 
2014
 
2013
 
2014
Share-based compensation
$
5.9

 
$
7.0

 
$
17.3

 
$
22.2

Tax benefit
2.3

 
2.7

 
6.7

 
8.5

Schedule of Company Stock Option Transactions
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, 2013
3.0

 
$
77.71

 
 
Options granted
0.0

 
204.99

 
 
Options exercised
(0.6
)
 
59.89

 
 
Options forfeited
(0.1
)
 
81.50

 
 
Unexercised options outstanding—September 30, 2014
2.3

 
83.06

 
3.0
Exercisable at September 30, 2014
1.8

 
78.65

 
2.7
Schedule of Company Restricted Stock Unit Transactions
The following table summarizes the transactions of the Company's restricted stock units:
 
Restricted
Stock
 
Weighted
Average
Grant Date
Value
Unvested units—December 31, 2013
0.5

 
$
176.38

Units granted
0.0

 
190.42

Units vested
(0.1
)
 
132.88

Units forfeited
(0.0
)
 
173.77

Unvested units—September 30, 2014
0.4

 
183.08