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Share-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of 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
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, 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
Schedule of Fair Value of Options Granted and Assumptions
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
 
—
%
 
—
%
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, 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