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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Restricted Stock Unit Activity
The following table summarizes information about vested and nonvested RSUs for 2019:
 
RSUs
 
Shares
(in actual number of shares)
 
Weighted-Average
Grant Date
Fair Value
Nonvested at January 1
1,028,532

 
$
46.69

Granted (1)
1,246,040

 
$
35.51

Vested
(255,243
)
 
$
35.28

Forfeited
(358,126
)
 
$
41.80

Nonvested at December 31
1,661,203

 
$
40.56

(1) 
The RSUs granted during 2019 are primarily related to our employee annual equity award grant in March 2019 and non-employee director annual equity award grant in January 2019.
Weighted Average Grant-Date Fair Value of Restricted Stock Units Granted and Total Fair Value of Restricted Stock Units Vested
The weighted average grant-date fair value of RSUs and total fair value of RSUs vested are summarized in the following table:
 
2019
 
2018
 
2017
Weighted average grant-date fair value of RSUs granted
$
35.51

 
$
49.16

 
$
43.66

Total fair value of RSUs vested (in millions)
$
9.0

 
$
7.3

 
$
2.3
Stock Option Activity The following table summarizes stock option activity during 2019:
 
Stock Options
 
Shares
(in millions)
 
Weighted-
Average
Exercise Price
 
Weighted-
Average
Remaining
Contractual
Term (Years)
 
Aggregate
Intrinsic Value
(in millions)
Options outstanding at January 1
3.1

 
$
50.20

 
 
 
 
Granted
—

 
$
—

 
 
 
 
Exercised
(0.4
)
 
$
33.87

 
 
 
 
Forfeited
—

 
$
—

 
 
 
 
Expired
(0.1
)
 
$
55.35

 
 
 
 
Options outstanding as of December 31
2.6

 
$
52.29

 
4.49
 
$
5.7

Options exercisable at December 31
2.4

 
$
52.28

 
4.39
 
$
5.7

Options exercisable at December 31 and expected to vest thereafter
2.6

 
$
52.29

 
4.49
 
$
5.7

Options available for future grants at December 31
3.9

 
 
 
 
 
 
Restricted Stock Activity The following table summarizes information about vested and nonvested restricted stock for 2019:
 
Restricted Stock
 
Shares
(in actual number of shares)
 
Weighted-Average
Grant Date
Fair Value
Nonvested at January 1
70,718

 
$
55.38

Granted
—

 
$
—

Vested
(44,406
)
 
$
56.92

Forfeited
(10,045
)
 
$
52.41

Nonvested at December 31
16,267

 
$
52.53
Total Stock-Based Compensation Expense
The following table summarizes the total stock-based compensation expense recognized in Selling, General, and Administrative Expenses in the Consolidated Statements of Income and the total recognized tax benefit related thereto:
 
2019
 
2018
 
2017
RSUs
$
29.4

 
$
21.7

 
$
14.2

Stock options
0.9

 
1.6

 
3.1

Restricted stock
0.8

 
2.2

 
3.3

Total stock-based compensation expense
$
31.1

 
$
25.5

 
$
20.6

 
 
 
 
 
 
Tax benefit related to stock-based compensation expense
$
2.5

 
$
3.0

 
$
7.8