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Contract Balances (Details) - USD ($)
$ in Millions
12 Months Ended
Jan. 31, 2021
Jan. 31, 2020
Jan. 31, 2019
Revenue from Contract with Customer [Abstract]      
Contract assets $ 17.5 $ 13.4  
Contract assets, noncurrent 0.6 0.9  
Revenue recognized that was included in contract liability balance at the beginning of the period $ 499.5 $ 374.8 $ 264.0
Payment term 30 days