Property, Plant and Equipment Property, Plant and Equipment Additional (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Property, Plant and Equipment [Abstract]
Depreciation and amortization expense		$ 200.8	$ 202.5	$ 196.3
Asset impairment charges	$ 25.4	$ 10.0	$ 25.4	$ 0.0