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Contract Balances (Details) - USD ($)
$ in Millions
3 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Jan. 31, 2019
Revenue from Contract with Customer [Abstract]      
Contract assets $ 14.6   $ 11.9
Contract assets, noncurrent 1.3   $ 1.3
Revenue recognized that was included in contract liability balance at the beginning of the period $ 157.0 $ 112.0  
Payment term 30 days