Property, Plant and Equipment Property, Plant and Equipment Additional (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Property, Plant and Equipment [Abstract]
Provision for depreciation and amortization		$ 202.5	$ 196.3	$ 182.8
Asset impairment charge	$ 25.4	$ 25.4	$ 0.0	$ 0.0