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Earnings Per Share (Tables)
 6 Months Ended
Aug. 24, 2018
Earnings Per Share [Abstract]  
Computation of Basic and Diluted Earnings Per Share
 
Three Months Ended
Six Months Ended
Computation of Earnings per Share
August 24,
2018
August 25,
2017
August 24,
2018
August 25,
2017
Net income
$
49.1

 
$
36.9

 
$
66.1

 
$
55.0

 
Adjustment for earnings attributable to participating securities
(1.0
)
 
(0.7
)
 
(1.3
)
 
(1.0
)
 
Net income used in calculating earnings per share
$
48.1

 
$
36.2

 
$
64.8

 
$
54.0

 
Weighted-average common shares outstanding including participating securities (in millions)
119.2

 
119.7

 
119.0

 
119.8

 
Adjustment for participating securities (in millions)
(2.5
)
 
(2.4
)
 
(2.3
)
 
(2.2
)
 
Shares used in calculating basic earnings per share (in millions)
116.7

 
117.3

 
116.7

 
117.6

 
Effect of dilutive stock-based compensation (in millions)
—

 
0.2

 
—

 
0.2

 
Shares used in calculating diluted earnings per share (in millions)
116.7

 
117.5

 
116.7

 
117.8

 
Earnings per share:
 

 
 

 
 

 
 

 
Basic
$
0.41

 
$
0.31

 
$
0.56

 
$
0.46

 
Diluted
$
0.41

 
$
0.31

 
$
0.56

 
$
0.46

 
Total common shares outstanding at period end (in millions)
116.7

 
116.0

 
116.7

 
116.0

 
 
 
 
 
 
 
 
 
 
Anti-dilutive performance units excluded from the computation of diluted earnings per share (in millions)
0.5

 
0.5

 
0.5

 
0.5