Property, Plant and Equipment (Details) - USD ($) $ in Millions	Jan. 31, 2018	Jan. 31, 2017
Property, Plant and Equipment [Abstract]
Land	$ 41.8	$ 41.8
Buildings	123.0	122.5
Leasehold And Building Improvements	1,328.6	1,195.8
Office Equipment	267.4	245.7
Software	353.2	312.4
Furniture and Fixtures	311.6	281.2
Machinery and Equipment	187.4	177.7
Construction-in-Progress	105.1	78.6
Property, Plant and Equipment, Gross	2,718.1	2,455.7
Accumulated Depreciation and Amortization	(1,727.6)	(1,523.9)
Property, Plant and Equipment, Net	$ 990.5	$ 931.8