Stockholders' Equity - Additions to and Reclassifications out of Accumulated Other Comprehensive (Loss) Earnings (Details) - USD ($) $ in Millions		12 Months Ended
		Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Equity [Abstract]
Foreign currency translation adjustments		$ (59.9)	$ (101.9)	$ (31.7)
Income tax benefit		0.9	8.8	4.5
Foreign currency translation adjustments		(59.0)	(93.1)	(27.2)
Unrealized (loss) gain on marketable securities		(4.1)	(0.9)	1.2
Reclassification for gain included in net earnings a	[1]	(0.4)	0.0	0.0
Income tax benefit (expense)		1.6	0.1	(0.4)
Unrealized (loss) gain on marketable securities		(2.9)	(0.8)	0.8
Unrealized (loss) gain on hedging instruments		(22.2)	14.6	8.7
Reclassification adjustment for gain included in net earnings b	[2]	(11.7)	(13.0)	(14.0)
Income tax benefit (expense)		12.5	(0.4)	1.9
Unrealized (loss) gain on hedging instruments		(21.4)	1.2	(3.4)
Prior service cost		0.0	(0.5)	0.0
Net actuarial gain (loss)		122.5	(234.6)	86.3
Amortization of net loss included in net earnings	[3]	30.4	13.1	19.2
Amortization of prior service (credit) cost included in net earnings	[3]	(0.6)	(0.4)	0.3
Income tax (expense) benefit		(56.6)	83.2	(40.7)
Net unrealized gain (loss) on benefit plans		95.7	(139.2)	65.1
Other comprehensive earnings (loss), net of tax		$ 12.4	$ (231.9)	$ 35.3

[1] These losses are reclassified into Other expense (income), net.

[2] These gains are reclassified into Interest expense and financing costs and Cost of sales (see "Note H - Hedging Instruments" for additional details).

[3] These accumulated other comprehensive income components are included in the computation of net periodic pension costs (see "Note N - Employee Benefit Plans" for additional details).