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Contract Balances (Details) - USD ($)
$ in Millions
6 Months Ended
Jul. 31, 2019
Jul. 31, 2018
Jan. 31, 2019
Revenue from Contract with Customer [Abstract]      
Contract assets $ 16.8   $ 11.9
Contract assets, noncurrent 1.3   $ 1.3
Revenue recognized that was included in contract liability balance at the beginning of the period $ 265.7 $ 157.3  
Payment term 30 days