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Share-Based Payments (Tables)
 6 Months Ended
Jun. 30, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of components of share-based compensation expense
The following table summarizes components of the share-based compensation expense:
 
Thirteen Weeks Ended
 
Twenty-Six Weeks Ended
 
June 30, 2012
 
June 25, 2011
 
June 30, 2012
 
June 25, 2011
 
(In millions)
Stock options and SOSARs
 
 
 
 
 
 
 
Pre-tax compensation expense
$
0.7

 
$
1.1

 
$
2.6

 
$
3.9

Tax benefit
(0.2
)
 
(0.3
)
 
(0.8
)
 
(1.1
)
After-tax compensation expense
$
0.5

 
$
0.8

 
$
1.8

 
$
2.8

RSUs and DSUs
 
 
 
 
 
 
 
Pre-tax compensation expense
$
2.5

 
$
3.1

 
$
4.6

 
$
5.4

Tax benefit
(0.7
)
 
(0.8
)
 
(1.3
)
 
(1.3
)
After-tax compensation expense
$
1.8

 
$
2.3

 
$
3.3

 
$
4.1

PUs
 
 
 
 
 
 
 
Pre-tax compensation expense
$
1.9

 
$
2.0

 
$
2.9

 
$
5.0

Tax benefit
(0.5
)
 
(0.6
)
 
(0.9
)
 
(1.5
)
After-tax compensation expense
$
1.4

 
$
1.4

 
$
2.0

 
$
3.5

Total after-tax compensation expense
$
3.7

 
$
4.5

 
$
7.1

 
$
10.4
Schedule of stock options and SOSARs outstanding and the activity for the period
The following table represents the summary of stock options and SOSARs outstanding as of June 30, 2012, and the activity during the first half of 2012:
 
Outstanding
options
 
Weighted-average
exercise price per
share
 
Weighted-average
remaining
contractual life
(years)
 
Aggregate
intrinsic value
 
(In millions, except per share amounts and years)
Outstanding as of December 31, 2011
7.1
 
$38.69
 
4.31
 
$
43.1

Granted
0.2
 
$42.80
 
 
 
 
Exercised
(0.7)
 
$30.06
 
 
 
 
Forfeited
(0.1)
 
$46.86
 
 
 
 
Outstanding as of June 30, 2012
6.5
 
$39.70
 
4.28
 
$
26.0

Exercisable at June 30, 2012
5.6
 
$39.09
 
3.63
 
$
26.0
Schedule of non-vested RSUs, PUs and DSUs outstanding and the activity for the period
The following table represents non-vested RSUs, DSUs and PUs as of June 30, 2012, and the activity during the first half of 2012:
 
RSUs and DSUs
 
PUs
 
Units
 
Weighted-average
grant date fair value
per unit
 
Units
 
Weighted-average
grant date fair value
per unit
 
(In millions, except
per unit amounts)
 
(In millions, except
per unit amounts)
Non-vested as of December 31, 2011
0.6

 
$43.35
 
2.0

 
$11.67
Granted
0.3

 
$42.12
 
0.7

 
$14.35
Vested
(0.2
)
 
$42.46
 
(0.7
)
 
$10.92
Forfeited
—

 
$43.35
 
(0.1
)
 
$11.20
Non-vested as of June 30, 2012
0.7

 
$43.20
 
1.9

 
$11.41
Schedule of share-based compensation weighted average assumptions
The fair value of each option granted in the first half of 2012 and 2011, respectively, was determined on the date of grant using the Black-Scholes option-pricing model with the following weighted-average assumptions:
 
Twenty-Six Weeks Ended
 
June 30, 2012
 
June 25, 2011
Risk-free interest rate
1.56%
 
2.55%
Dividend yield
2.98%
 
2.52%
Volatility range
25.80%-27.56%
 
25.26%-28.11%
Weighted-average volatility
25.84%
 
26.37%
Expected term (years)
4.0-7.7
 
4.0-7.7
Weighted-average fair market value
$8.18
 
$9.66