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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Assumptions Used Relating to Valuation of Stock Options
The following table summarizes the assumptions used related to the valuation of our stock options during 2015, 2014, and 2013:
 
Grant Year
 
2015
 
2014
 
2013
Risk-free interest rate
0.76% - 1.86%

 
1.11% - 2.04%

 
0.58% - 2.24%

Expected dividend yield
—

 
—

 
—

Expected term
2 - 7 years

 
4 - 7 years

 
4 - 7 years

Expected volatility
24% - 34%

 
25% - 36%

 
29% - 44%
Stock Option Activity
The following table summarizes stock option activity during 2015:
 
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
5.0

 
$
36.43

 
 
 
 
Granted (1)
1.0

 
$
62.06

 
 
 
 
Exercised
(1.3
)
 
$
23.33

 
 
 
 
Forfeited
(0.1
)
 
$
51.50

 
 
 
 
Expired
—

 
$
—

 
 
 
 
Options outstanding as of December 31
4.6

 
$
45.07

 
6.89
 
$
70.1

Options exercisable at December 31
2.3

 
$
35.09

 
5.55
 
$
57.1

Options exercisable at December 31 and expected to vest thereafter
4.6

 
$
44.76

 
6.80
 
$
70.4

Options available for future grants at December 31
4.3

 
 
 
 
 
 
(1) 
The options granted during 2015, are primarily related to our employee quarterly stock option award grants in March, June, September, and December 2015.
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:
 
2015
 
2014
 
2013
Weighted average grant-date fair value of stock options granted
$
19.38

 
$
20.56

 
$
17.93

Total intrinsic value of stock options exercised (in millions)
$
51.9

 
$
56.2

 
$
31.3
Restricted Stock Activity
The following table summarizes information about vested and unvested restricted stock for 2015:
 
Restricted Stock
 
Shares
(in actual number of shares)
 
Weighted-Average
Grant Date
Fair Value
Nonvested at January 1
306,442

 
$
42.52

Granted (1)
159,442

 
$
62.54

Vested
(140,019
)
 
$
41.44

Forfeited
(41,581
)
 
$
48.02

Nonvested at December 31
284,284

 
$
53.11

(1) 
The restricted stock awards granted during 2015 are primarily related to our employee annual restricted stock award grant in March 2015.
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:
 
2015
 
2014
 
2013
Weighted average grant-date fair value of restricted stock awards granted
$
62.54

 
$
52.87

 
$
43.45

Total fair value of restricted stock awards vested (in millions)
$
8.8

 
$
8.1

 
$
6.8
Weighted Average Grant-Date Fair Value of Restricted Stock Units Granted and Total Fair Value of Restricted Stock Units Granted and Vested
The weighted average grant-date fair value and total grant-date fair value of RSUs granted (and vested) are summarized in the following table:
 
2015
 
2014
 
2013
Weighted average grant-date fair value of RSUs granted
$
60.04

 
$
53.57

 
$
—

Total fair value of RSUs granted (in millions)
$
2.7

 
$
2.1

 
$
—
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:
 
2015
 
2014
 
2013
Stock options
$
14.8

 
$
18.4

 
$
16.6

Restricted stock
6.5

 
5.8

 
4.7

RSUs
2.7

 
2.1

 
—

Total stock-based compensation expense
$
24.0

 
$
26.3

 
$
21.3

 
 
 
 
 
 
Tax benefit related to stock-based compensation expense
$
9.2

 
$
10.0

 
$
8.1