Property and Equipment, Net (Property and Equipment) (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 369.8	$ 400.4
Less accumulated depreciation	109.3	67.1
Property, Plant and Equipment, Net, Total	$ 260.5	333.3
Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful lives (years)	1 year
Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful lives (years)	50 years
Land, buildings and improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 35.5	30.2
Land, buildings and improvements | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful lives (years)	3 years
Land, buildings and improvements | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful lives (years)	50 years
Machinery
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 89.5	192.4
Machinery | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful lives (years)	2 years
Machinery | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful lives (years)	20 years
Computer Equipment and Software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 96.1	68.2
Computer Equipment and Software | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful lives (years)	1 year
Computer Equipment and Software | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful lives (years)	15 years
Furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 148.7	$ 109.6
Furniture and equipment | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful lives (years)	1 year
Furniture and equipment | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful lives (years)	14 years