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Summary of Significant Accounting Policies and Related Information - General and cash (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Feb. 28, 2019
USD ($)
Segment
$ / shares
Feb. 28, 2018
USD ($)
$ / shares
Feb. 28, 2017
USD ($)
Accounting Policies [Abstract]      
Customer incentives in SG&A $ 17.0 $ 11.8 $ 12.1
Advertising Expense $ 62.4 $ 53.7 $ 51.5
Common stock, par (in dollars per share) | $ / shares $ 0.10 $ 0.10  
Number of segments | Segment 3