Summary of Significant Accounting Policies Foreign Currency (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Foreign Currency [Abstract]
Net Gain (Loss) on Foreign Currency Transactions	$ (9.8)	$ (3.7)	$ 4.7
Transaction Gain Related to Arbitration Award			$ 7.5