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Earnings Per Share (Tables)
 12 Months Ended
Feb. 28, 2020
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Computation of Earnings per Share
Year Ended
February 28,
2020
February 22,
2019
February 23,
2018
Net income
$
199.7

 
$
126.0

 
$
80.7

 
Adjustment for earnings attributable to participating securities
(3.9
)
 
(2.5
)
 
(1.5
)
 
Net income used in calculating earnings per share
$
195.8

 
$
123.5

 
$
79.2

 
Weighted-average common shares outstanding including participating securities (in millions)
119.6

 
119.1

 
119.2

 
Adjustment for participating securities (in millions)
(2.3
)
 
(2.4
)
 
(2.3
)
 
Shares used in calculating basic earnings per share (in millions)
117.3

 
116.7

 
116.9

 
Effect of dilutive stock-based compensation (in millions)
0.6

 
0.4

 
0.2

 
Shares used in calculating diluted earnings per share (in millions)
117.9

 
117.1

 
117.1

 
Earnings per share:
 
 
 
 
 
 
Basic
$
1.67

 
$
1.06

 
$
0.68

 
Diluted
$
1.66

 
$
1.05

 
$
0.68

 
Total common shares outstanding at period end (in millions)
117.2

 
116.8

 
116.2

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

 
0.2

 
0.5