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Share-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Share-Based Compensation
The following is a summary of share-based compensation expense:
 
For the Three Months Ended September 30,
 
For the Nine Months Ended September 30,
 
2016
 
2017
 
2016
 
2017
Share-based compensation
$
10.7

 
$
10.3

 
$
30.7

 
$
30.0

Tax benefit
4.1

 
4.0

 
11.8

 
11.5
Schedule of Company Stock Option Transactions
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, 2016
1.4

 
$
108.53

 
 
Options granted
0.0

 
168.60

 
 
Options exercised
(0.6
)
 
96.86

 
 
Options forfeited
(0.1
)
 
140.26

 
 
Unexercised options outstanding - September 30, 2017
0.7

 
118.35

 
3.5
Exercisable at September 30, 2017
0.3

 
108.55

 
1.5
Schedule of Fair Value of Options Granted and Assumptions
For the nine months ended September 30, 2016 and 2017, the weighted average fair values of options granted were $39.02 and $48.05, per option, respectively, based on the weighted-average grant date assumptions stated below.
 
 
For the Nine Months Ended September 30,
 
 
2016
 
2017
Dividend yield
 
—

 
0.5
%
Expected volatility
 
30.7
%
 
28.0
%
Risk-free interest rate
 
1.6
%
 
2.1
%
Expected life of options (in years)
 
5.7

 
5.7

Forfeiture rate
 
—

 
—
Schedule of Company Restricted Stock Unit Transactions
The following table summarizes transactions in the Company’s restricted stock units:
 
Restricted
Stock Units
 
Weighted
Average
Grant Date
Value
Unvested units - December 31, 2016
0.6

 
$
168.84

Units granted
0.2

 
153.09

Units vested
(0.2
)
 
167.72

Units forfeited
(0.0
)
 
170.52

Unvested units - September 30, 2017
0.6

 
162.97