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Share-Based Compensation and Capital Stock (Tables)
 3 Months Ended
Mar. 31, 2014
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:
        
 
2014 Grants
 
2013 Grants
Risk-free interest rate
1.56
%
 
0.73
%
Expected volatility
25.01
%
 
38.14
%
Expected life of stock option
4.5 years

 
4.5 years

Dividend yield
1.62
%
 
2.01
%
Requisite service period
4 years

 
4 years

Contractual life
7 years

 
7 years

Weighted average fair value of options granted
$
8.82

 
$
9.89
Summary Of Activity Related To Restricted Stock Grants
The following table is a summary of activity related to restricted stock grants: 
 
Three Months Ended
 
March 31,
 
2014
 
2013
Restricted share grants
129,793

 
194,541

Weighted average grant date fair value per share
$
46.71

 
$
36.76

Aggregate grant date fair value ($000)
$
6,062

 
$
7,151

Restricted shares forfeited
1,332

 
21,499

Vesting service period of shares granted
4 years

 
3 - 4 years

Grant date fair value of shares vested ($000)
$
7,269

 
$
6,999
Summary Of Activity Related To PVRSU Grants
The following table is a summary of activity related to PVRSU grants:
 
Three Months Ended
 
March 31,
 
2014
 
2013
Performance vested restricted stock units granted at target
43,871

 
58,902

Weighted average grant date fair value per share
$
45.59

 
$
36.76

Aggregate grant date fair value ($000)
$
2,000

 
$
2,165

Stock units forfeited
—

 
—

Requisite service period
36 months

 
22-36 months
Summary Of Change In Stock-Based Award Activity
A summary of stock-based award activity as of March 31, 2014 and changes during the three 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, 2014
1,661,952

 
$
26.44

 
 
 
563,345

 
$
36.64

 
216,342

 
$
37.34

Granted
651,757

 
$
45.59

 
 
 
129,793

 
$
46.71

 
43,871

 
$
45.59

Performance based leveraging (1)
—

 
$
—

 
 
 
—

 
$
—

 
10,251

 
$
41.25

Exercised/Vested
(58,749
)
 
$
26.33

 
 
 
(151,957
)
 
$
36.57

 
(28,886
)
 
$
41.25

Expired
—

 
$
—

 
 
 
—

 
$
—

 
—

 
$
—

Forfeited
—

 
$
—

 
 
 
(1,332
)
 
$
37.57

 
—

 
$
—

Outstanding at March 31, 2014
2,254,960

 
$
31.98

 
4.0
 
539,849

 
$
39.08

 
241,578

 
$
38.54

Options exercisable at March 31, 2014
1,326,714

 
$
25.24

 
2.3
 
 
 
 
 
 
 
 

_________________________________ 
(1)PVRSU units outstanding have been increased by 10,251 units due to the Company exceeding the targeted performance conditions contained in PVRSUs granted in prior periods during the three months ended March 31, 2014.
Pre-Tax Stock-Based Compensation Expenses And Associated Income Tax Benefits
The components of the Company’s pretax share-based compensation expense and associated income tax benefits are as follows for the three months ended March 31, 2014 and 2013:
 
Three Months Ended
 
March 31,
(in millions)
2014
 
2013
Stock options
$
0.4

 
$
0.5

Restricted stock
1.9

 
1.8

Performance vested restricted stock units
0.7

 
0.6

Total
$
3.0

 
$
2.9

Income tax benefits
$
1.1

 
$
1.1