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Earnings Per Share (Tables)
 12 Months Ended
Feb. 22, 2019
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Computation of Earnings per Share
Year Ended
February 22,
2019
February 23,
2018
February 24,
2017
Net income
$
126.0

 
$
80.7

 
$
124.6

 
Adjustment for earnings attributable to participating securities
(2.5
)
 
(1.5
)
 
(2.4
)
 
Net income used in calculating earnings per share
$
123.5

 
$
79.2

 
$
122.2

 
Weighted-average common shares outstanding including participating securities (in millions)
119.1

 
119.2

 
120.7

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

 
116.9

 
118.4

 
Effect of dilutive stock-based compensation (in millions)
0.4

 
0.2

 
0.5

 
Shares used in calculating diluted earnings per share (in millions)
117.1

 
117.1

 
118.9

 
Earnings per share:
 
 
 
 
 
 
Basic
$
1.06

 
$
0.68

 
$
1.03

 
Diluted
$
1.05

 
$
0.68

 
$
1.03

 
Total common shares outstanding at period end (in millions)
116.8

 
116.2

 
117.3

 
Anti-dilutive performance units excluded from the computation of diluted earnings per share (in millions)
0.2

 
0.5

 
0.3