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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Restricted Stock Unit Activity The following table summarizes information about vested and nonvested RSUs for 2018:
 
RSUs
 
Shares
(in actual number of shares)
 
Weighted-Average
Grant Date
Fair Value
Nonvested at January 1
519,609

 
$
43.22

Granted (1)
670,366

 
$
49.16

Vested
(146,200
)
 
$
45.99

Forfeited
(15,243
)
 
$
44.53

Nonvested at December 31
1,028,532

 
$
46.69

(1) 
The RSUs granted during 2018 are primarily related to our employee annual equity award grant in March 2018 and non-employee director annual equity award grant in January 2018.
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:
 
2018
 
2017
 
2016
Weighted average grant-date fair value of RSUs granted
$
49.16

 
$
43.66

 
$
58.69

Total fair value of RSUs vested (in millions)
$
7.3

 
$
2.2

 
$
2.3
Assumptions Used Related to Valuation of Stock Options The following table summarizes the assumptions used related to the valuation of our stock options granted during 2016:
 
2016
Risk-free interest rate
1.16% - 1.55%

Expected dividend yield
—

Expected term
4 - 7 years

Expected volatility
29% - 31%
Stock Option Activity The following table summarizes stock option activity during 2018:
 
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
3.7

 
$
48.49

 
 
 
 
Granted
—

 
$
—

 
 
 
 
Exercised
(0.5
)
 
$
35.25

 
 
 
 
Forfeited
—

 
$
—

 
 
 
 
Expired
(0.1
)
 
$
59.75

 
 
 
 
Options outstanding as of December 31
3.1

 
$
50.20

 
5.13
 
$
2.5

Options exercisable at December 31
2.7

 
$
49.34

 
4.78
 
$
2.5

Options exercisable at December 31 and expected to vest thereafter
3.1

 
$
50.23

 
5.08
 
$
2.5

Options available for future grants at December 31
4.8

 
 
 
 
 
 
Weighted Average Grant-Date Fair Value of Stock Options Granted and Total Intrinsic Value of Stock Options Exercised The weighted average grant-date fair value of stock options granted and total intrinsic value of stock options exercised are summarized in the following table:
 
2018
 
2017
 
2016
Weighted average grant-date fair value of stock options granted
$
—

 
$
—

 
$
17.96

Total intrinsic value of stock options exercised (in millions)
$
8.2

 
$
11.9

 
$
5.3
Restricted Stock Activity The following table summarizes information about vested and nonvested restricted stock for 2018:
 
Restricted Stock
 
Shares
(in actual number of shares)
 
Weighted-Average
Grant Date
Fair Value
Nonvested at January 1
147,931

 
$
55.65

Granted
—

 
$
—

Vested
(68,842
)
 
$
55.84

Forfeited
(8,371
)
 
$
56.27

Nonvested at December 31
70,718

 
$
55.38
Weighted Average Grant-Date Fair Value of Restricted Stock Awards Granted and Total Fair Value of Restricted Stock Awards Vested The weighted average grant-date fair value of restricted stock awards granted and total fair value of restricted stock awards vested are summarized in the following table:
 
2018
 
2017
 
2016
Weighted average grant-date fair value of restricted stock awards granted
$
—

 
$
—

 
$
52.23

Total fair value of restricted stock awards vested (in millions)
$
3.3

 
$
4.2

 
$
6.4
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:
 
2018
 
2017
 
2016
RSUs
$
21.7

 
$
14.2

 
$
2.3

Stock options
1.6

 
3.1

 
16.2

Restricted stock
2.2

 
3.3

 
6.6

Total stock-based compensation expense
$
25.5

 
$
20.6

 
$
25.1

 
 
 
 
 
 
Tax benefit related to stock-based compensation expense
$
3.0

 
$
7.8

 
$
9.6