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Share-Based Compensation and Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2013
Summary of shares authorized and available for future issuance under compensation and benefit plans
Plans
 
Total Shares Authorized for Issuance under the Plans
 
Shares Available for Future
Issuance under the Plans
Employee Incentive Plans
 
34,000

 
6,711

Director Stock Plan
 
1,000

 
267

Performance Incentive Plan
 
650

 
378

Employee Stock Purchase Plans
 
4,250

 
901

Profit Sharing and Savings Plan
 
4,200

 
349
Restricted Stock [Member]
  
Summary of activity of share-based employee compensation plans and other compensation and benefit plans
 
For the Year Ended December 31,
 
2013
 
2012
 
2011
Compensation expense for restricted shares awarded (in millions)
$
2.2

 
$
2.0

 
$
1.7

Income tax benefit from compensation expense related to restricted shares (in millions)
$
0.8

 
$
0.8

 
$
0.6

Total fair value of restricted shares at vest date (in millions)
$
3.3

 
$
2.7

 
$
2.6

Shares awarded under the plans (in thousands)
21.2

 
23.7

 
49.9

Average grant-date fair value of shares awarded under the plans
$
102.63

 
$
90.10

 
$
56.18
Director [Member]
  
Summary of stock options
 
Shares
(in thousands)
 
Weighted-Average Exercise Price
 
Average Remaining Contractual Terms
(in years)
 
Aggregate
Intrinsic Value
(in thousands)
Outstanding at December 31, 2012
68

 
$
35.03

 
 
 
 
Granted
—

 
—

 
 
 
 
Exercised
(18
)
 
28.54

 
 
 
 
Forfeited
—

 
—

 
 
 
 
Outstanding at December 31, 2013
50

 
$
37.37

 
2.5
 
$
4,567

Vested or expected to vest at December 31, 2013
50

 
$
37.37

 
2.5
 
$
4,567

Exercisable at December 31, 2013
50

 
$
37.37

 
2.5
 
$
4,567
Director [Member] | Restricted Stock [Member]
  
Summary of restricted stock
 
Shares
(in thousands)
 
Weighted-Average Grant-Date Fair Value
Non-vested at December 31, 2012
10

 
$
79.58

Granted during the period
5

 
109.45

Vested during the period
(4
)
 
75.39

Forfeited during the period
—

 
—

Non-vested at December 31, 2013
11

 
$
94.18
Employee Stock [Member]
  
Summary of stock options
 
Shares
(in thousands)
 
Weighted-Average Exercise Price
 
Average Remaining Contractual Terms
(in years)
 
Aggregate
Intrinsic Value
(in thousands)
Outstanding at December 31, 2012
6,721

 
$
51.03

 
 
 
 
Granted
363

 
105.11

 
 
 
 
Exercised
(1,375
)
 
43.09

 
 
 
 
Forfeited
(532
)
 
76.77

 
 
 
 
Outstanding at December 31, 2013
5,177

 
$
54.28

 
6.1
 
$
385,330

Vested or expected to vest at December 31, 2013
4,909

 
$
52.87

 
6.0
 
$
372,291

Exercisable at December 31, 2013
3,169

 
$
36.92

 
4.8
 
$
290,911
Employee Stock [Member] | Restricted Stock [Member]
  
Summary of restricted stock
 
Shares
(in thousands)
 
Weighted-Average Grant-Date Fair Value
Non-vested at December 31, 2012
27

 
$
70.64

Granted during the period
16

 
100.82

Vested during the period (1)
(22
)
 
73.67

Forfeited during the period
(1
)
 
83.06

Non-vested at December 31, 2013
20

 
$
92.02

(1) 
Includes 9 thousand shares withheld to cover employees' taxes upon vesting.
Stock Option [Member]
  
Black-Scholes option pricing model
 
December 31,
 
2013
 
2012
 
2011
Risk free interest rate
0.96
%
 
 
0.59
%
 
 
1.16
%
 
Expected life
5.0

Years
 
3.9

Years
 
3.7

Years
Expected volatility
31.0
%
 
 
33.5
%
 
 
33.3
%
 
Expected dividend yield
—
%
 
 
—
%
 
 
—
%
 
Summary of activity of share-based employee compensation plans and other compensation and benefit plans
 
For the Year Ended December 31,
 
2013
 
2012
 
2011
Compensation expense for stock options awarded (in millions)
$
17.8

 
$
18.5

 
$
17.6

Income tax benefit from compensation expense related to stock options (in millions)
6.8

 
7.1

 
6.8

Total intrinsic value of stock options exercised (in millions)
95.8

 
113.6

 
71.5

Cash received from exercise of stock options (in millions)
59.7

 
54.9

 
50.3

Weighted-average grant-date fair value of options awarded
$
29.98

 
$
23.57

 
$
16.93

Weighted-average remaining contractual life of exercisable options (in years)
4.77

 
5.13

 
5.12
Employee Stock Purchase Plan [Member]
  
Summary of activity of share-based employee compensation plans and other compensation and benefit plans
 
For the Year Ended December 31,
 
2013
 
2012
 
2011
Compensation expense for shares issued under the ESPP (in millions)
$
1.7

 
$
1.5

 
$
1.3

Income tax benefit from compensation expense for shares issued under the ESPP (in millions)
$
0.6

 
$
0.6

 
$
0.5

Shares issued under the ESPP (in thousands)
100.6

 
114.6

 
134.5

Weighted-average price of shares issued under the ESPP
$
95.51

 
$
75.42

 
$
53.93