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Share-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2020
Share-based Payment Arrangement [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,
 
2019
 
2020
 
2019
 
2020
Share-based compensation
$
10.2

 
$
22.5

 
$
19.0

 
$
30.7

Tax benefit
2.5

 
4.1

 
4.7

 
5.6
Schedule of Company Restricted Stock Units 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, 2019
1.1

 
$
123.70

Units granted
0.4

 
73.89

Units vested
(0.3
)
 
143.45

Units forfeited
(0.0
)
 
140.33

Performance condition changes
(0.1
)
 
114.65

Unvested units - June 30, 2020
1.1

 
98.78
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, 2019
2.3

 
$
85.58

 
 
Options granted
0.2

 
74.69

 
 
Options exercised
—

 
—

 
 
Options forfeited
(0.0
)
 
117.13

 
 
Performance condition changes
—

 
—

 
 
Unexercised options outstanding - June 30, 2020
2.5

 
84.35

 
5.5
Exercisable at June 30, 2020
0.4

 
131.70

 
2.2
Schedule of Fair Value of Options Granted and Assumptions The weighted average grant date assumptions used to estimate the fair value of stock options granted were as follows:
 
 
For the Six Months Ended June 30,
 
 
2019
 
2020
Dividend yield
 
1.2
%
 
1.7
%
Expected volatility
 
31.9
%
 
29.4
%
Risk-free interest rate
 
2.6
%
 
0.9
%
Expected life of options (in years)
 
5.7

 
5.7

Forfeiture rate
 
—
%
 
—
%