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Share-Based Compensation and Capital Stock (Tables)
 9 Months Ended
Sep. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Weighted Average Assumptions Of Black-Scholes Option-Pricing Model
The fair value of the options granted was estimated on the grant date using the Black-Scholes option-pricing model with the following weighted average assumptions:
        
 
2013 Grants
 
2012 Grants
Risk-free interest rate
0.73
%
 
0.78
%
Expected volatility
38.14
%
 
40.15
%
Expected life of stock option
4.5 years

 
4.4 years

Dividend yield
2.01
%
 
2.08
%
Requisite service period
4 years

 
4 years

Contractual life
7 years

 
7 years

Weighted average fair value of options granted
$
9.89

 
$
9.98
Summary Of Activity Related To Restricted Stock Grants
The following table is a summary of activity related to restricted stock grants: 
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2013
 
2012
 
2013
 
2012
Restricted share grants
7,646

 
7,672

 
223,045

 
266,159

Weighted average grant date fair value per share
$
39.24

 
$
32.59

 
$
37.65

 
$
35.76

Aggregate grant date fair value ($000)
$
300

 
$
250

 
$
8,397

 
$
9,517

Restricted shares forfeited
25

 
13,619

 
27,953

 
23,921

Vesting service period of shares granted
36 months

 
36 months

 
12 - 48 months

 
12 - 68 months

Grant date fair value of shares vested ($000)
$
94

 
$
75

 
$
8,569

 
$
6,693
Summary Of Activity Related To PVRSU Grants
The following table is a summary of activity related to PVRSU grants:
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2013
 
2012
 
2013
 
2012
Performance vested restricted stock units granted at target
—

 
6,137

 
58,902

 
100,046

Weighted average grant date fair value per share
$
—

 
$
32.59

 
$
36.76

 
$
35.68

Aggregate grant date fair value ($000)
$
—

 
$
200

 
$
2,165

 
$
3,570

Stock units forfeited
—

 
—

 
—

 
57,176

Requisite service period
—

 
41 months

 
22-36 months

 
36-60 months
Summary Of Change In Stock-Based Award Activity
A summary of stock-based award activity as of September 30, 2013 and changes during the nine months ended are presented below:
 
Stock Options
 
Restricted Stock
 
Performance Vested
Restricted Stock Units
 
Options
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual
Term
 
Shares
 
Weighted
Average
Grant Date
Fair Value
 
Shares
 
Weighted
Average
Grant Date
Fair Value
Outstanding at January 1, 2013
1,934,034

 
$
25.80

 
 
 
606,547

 
$
35.17

 
170,116

 
$
35.56

Granted
173,413

 
36.76

 
 
 
223,045

 
37.65

 
58,902

 
36.76

Performance based leveraging (1)
—

 
—

 
 
 
—

 
—

 
9,192

 
32.60

Exercised/Vested
(263,073
)
 
25.38

 
 
 
(227,890
)
 
33.94

 
(39,816
)
 
32.60

Expired
(75,473
)
 
36.99

 
 
 
—

 
—

 
—

 
—

Forfeited
—

 
—

 
 
 
(27,953
)
 
35.30

 
—

 
—

Outstanding at September 30, 2013
1,768,901

 
$
26.46

 
3.2 years
 
573,749

 
$
36.61

 
198,394

 
$
36.37

Options exercisable at September 30, 2013
1,265,481

 
$
24.70

 
2.4 years
 
 
 
 
 
 
 
 

_________________________________ 
(1)PVRSU shares have been increased by 9,192 units due to the Company exceeding the targeted performance conditions contained in PVRSUs granted in prior periods during the nine months ended September 30, 2013.
Pre-Tax Stock-Based Compensation Expenses And Associated Income Tax Benefits
The components of the Company’s pretax stock-based compensation expense and associated income tax benefits are as follows for the three and nine months ended September 30, 2013 and 2012:
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
(in millions)
2013
 
2012
 
2013
 
2012
Stock options
$
0.3

 
$
0.5

 
$
1.3

 
$
1.6

Restricted stock
2.1

 
1.8

 
5.7

 
5.7

Performance vested restricted stock units
0.5

 
0.8

 
1.7

 
1.3

Total
$
2.9

 
$
3.1

 
$
8.7

 
$
8.6

Income tax benefits
$
1.1

 
$
1.1

 
$
3.2

 
$
3.2