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Income Taxes - Provision for income taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Jan. 31, 2015	Oct. 31, 2014	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2013	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013
Federal:
Current									$ (43.8)us-gaap_CurrentFederalTaxExpenseBenefit	$ 29.1us-gaap_CurrentFederalTaxExpenseBenefit	$ 30.9us-gaap_CurrentFederalTaxExpenseBenefit
Deferred									(11.9)	(41.4)	(13.3)
State:
Current									(13.2)	0.6	7.8
Deferred									9.0	0	(18.6)
Foreign:
Current									69.5us-gaap_CurrentForeignTaxExpenseBenefit	63.9us-gaap_CurrentForeignTaxExpenseBenefit	54.3us-gaap_CurrentForeignTaxExpenseBenefit
Deferred									(8.4)	(1.1)	1.5
Income tax expense	$ (18.6)us-gaap_IncomeTaxExpenseBenefit	$ 0.9us-gaap_IncomeTaxExpenseBenefit	$ 11.6us-gaap_IncomeTaxExpenseBenefit	$ 7.3us-gaap_IncomeTaxExpenseBenefit	$ 2.4us-gaap_IncomeTaxExpenseBenefit	$ 11.6us-gaap_IncomeTaxExpenseBenefit	$ 20.1us-gaap_IncomeTaxExpenseBenefit	$ 17.0us-gaap_IncomeTaxExpenseBenefit	$ 1.2us-gaap_IncomeTaxExpenseBenefit	$ 51.1us-gaap_IncomeTaxExpenseBenefit	$ 62.6us-gaap_IncomeTaxExpenseBenefit