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Net Income Per Common Share (Tables)
 9 Months Ended
Sep. 28, 2013
Earnings Per Share [Abstract]  
Elements of Earnings per Share Computations
The elements of the earnings per share computations were as follows (in millions, except per share amounts):
 
13 weeks ended
 
39 weeks ended
 
September 28,
2013
 
September 29,
2012
 
September 28,
2013
 
September 29,
2012
Net income
$
49.9

 
$
47.5

 
$
184.5

 
$
118.5

Weighted-average shares of common stock outstanding
51.2

 
55.2

 
52.4

 
55.5

Common equivalent shares:
 
 
 
 
 
 
 
Assumed exercise of dilutive options, restricted shares, restricted stock units and performance share units
1.2

 
1.0

 
1.2

 
1.1

Weighted-average common and common equivalent shares outstanding
52.4

 
56.2

 
53.6

 
56.6

Basic earnings per share
$
0.97

 
$
0.86

 
$
3.52

 
$
2.14

Diluted earnings per share
$
0.95

 
$
0.85

 
$
3.44

 
$
2.09

Shares excluded from the determination of potential common stock because inclusion would have been anti-dilutive
—

 
0.4

 
—

 
0.3