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Share-Based Compensation and Capital Stock (Tables)
 3 Months Ended
Mar. 31, 2015
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:
        
 
2015 Grants
 
2014 Grants
Risk-free interest rate
1.45
%
 
1.56
%
Expected volatility
23.94
%
 
25.01
%
Expected life of stock option
4.6 years

 
4.5 years

Dividend yield
1.23
%
 
1.62
%
Requisite service period
4 years

 
4 years

Contractual life
7 years

 
7 years

Weighted average fair value of options granted (per option)
$
12.39

 
$
8.82
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,
 
2015
 
2014
Restricted share grants
85,792

 
129,793

Weighted average grant date fair value per share
$
63.46

 
$
46.71

Aggregate grant date fair value ($000)
$
5,445

 
$
6,062

Restricted shares forfeited
4,778

 
1,332

Vesting service period of shares granted
3-4 years

 
4 years

Fair value of shares vested ($000)
10,684

 
7,269
Summary Of Activity Related To PVRSU Grants
The following table is a summary of activity related to PVRSU grants:
 
Three Months Ended
 
March 31,
 
2015
 
2014
Performance vested restricted stock units granted at target
30,353

 
43,871

Weighted average grant date fair value per share
$
63.47

 
$
45.59

Aggregate grant date fair value ($000)
$
1,927

 
$
2,000

Stock units forfeited
—

 
—

Requisite service period
3 years

 
3 years
Summary Of Change In Stock-Based Award Activity
A summary of stock-based award activity as of March 31, 2015 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, 2015
1,903,177

 
$
33.03

 
 
 
479,556

 
$
40.14

 
200,286

 
$
38.28

Granted
498,911

 
$
63.47

 
 
 
85,792

 
$
63.46

 
30,353

 
$
63.47

Performance based leveraging (1)
—

 
$
—

 
 
 
—

 
$
—

 
3,850

 
$
35.60

Exercised/Vested
(228,963
)
 
$
24.54

 
 
 
(172,165
)
 
$
38.82

 
(42,326
)
 
$
35.60

Expired
—

 
$
—

 
 
 
—

 
$
—

 
—

 
$
—

Forfeited
(3,685
)
 
$
45.59

 
 
 
(4,778
)
 
$
39.89

 
—

 
$
—

Outstanding at March 31, 2015
2,169,440

 
$
40.91

 
4.6 years
 
388,405

 
$
45.88

 
192,163

 
$
42.79

Options exercisable at March 31, 2015
1,057,276

 
$
29.08

 
2.9 years
 
 
 
 
 
 
 
 

_________________________________ 
(1)PVRSU units outstanding have been increased by 3,850 units due to the Company exceeding the targeted performance conditions contained in PVRSUs granted in prior periods during the three months ended March 31, 2015.
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, 2015 and 2014:
 
Three Months Ended
 
March 31,
(in millions)
2015
 
2014
Stock options
$
0.7

 
$
0.4

Restricted stock
1.8

 
1.9

Performance vested restricted stock units
0.3

 
0.7

Total
$
2.8

 
$
3.0

Income tax benefits
$
1.0

 
$
1.1