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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of assumptions used relating to valuation of stock options
The following table summarizes the assumptions used relating to the valuation of our stock options during 2012, 2011, and 2010:
 
Grant Year
 
2012
 
2011
 
2010
Risk-free interest rate
0.49% - 1.40%

 
0.62% - 2.81%

 
1.18% - 3.24%

Expected dividend yield
—

 
—

 
—

Expected term
4 - 7 years

 
4 - 7 years

 
4 - 7 years

Expected volatility
39% - 48%

 
39% - 50%

 
40% - 49%
Schedule of stock option activity
The following table summarizes stock option activity during 2012:
 
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
6.8

 
$
21.03

 
 
 
 
Granted (1)
1.1

 
$
37.22

 
 
 
 
Exercised
(1.7
)
 
$
19.33

 
 
 
 
Forfeited
—

 
$
—

 
 
 
 
Expired
—

 
$
—

 
 
 
 
Options outstanding as of December 31
6.2

 
$
24.29

 
6.64
 
$
96.2

Options exercisable at December 31
3.6

 
$
19.18

 
5.54
 
$
74.1

Options exercisable at December 31 and expected to vest thereafter
6.2

 
$
24.19

 
6.61
 
$
96.1

Options available for future grants at December 31
6.9

 
 
 
 
 
 
(1) 
The options granted during 2012, are primarily related to our employee and non-employee director quarterly stock option award grants in March, June, September, and December 2012.
Schedule of 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:
 
 
 
2012
 
2011
 
2010
Weighted average grant-date fair value of stock options granted
$
15.25

 
$
15.69

 
$
9.57

Total intrinsic value of stock options exercised
$
36.2

 
$
81.0

 
$
24.8
Schedule of vested and unvested restricted stock
The following table summarizes information about vested and unvested restricted stock for 2012:
 
Restricted Stock
 
Shares
(in millions)
 
Weighted-Average
Grant Date
Fair Value
Nonvested at January 1
0.4

 
$
21.17

Granted (1)
0.2

 
$
34.31

Vested
(0.2
)
 
$
18.75

Forfeited
(0.1
)
 
$
29.47

Nonvested at December 31
0.3

 
$
27.81

(1) 
The restricted stock awards granted during 2012 are primarily related to our employee annual restricted stock award grant in March 2012.
Schedule of 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:
 
 
 
2012
 
2011
 
2010
Weighted average grant-date fair value of restricted stock awards granted
$
34.31

 
$
32.50

 
$
18.20

Total fair value of restricted stock awards vested
$
5.8

 
$
5.5

 
$
2.2
Schedule of 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:
 
2012
 
2011
 
2010
Stock options
$
14.8

 
$
15.2

 
$
14.0

Restricted stock
3.8

 
3.2

 
1.9

Total stock-based compensation expense
$
18.6

 
$
18.4

 
$
15.9

 
 
 
 
 
 
Tax benefit related to stock-based compensation expense
$
7.1

 
$
7.0

 
$
6.1