Debt Debt (Bridge Loan Facility) (Details) - Bridge Loan - TS - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2017	Sep. 19, 2016
Bridge Facility [Line Items]
Debt Instrument Unused Commitment	$ 300.0	$ 3,100.0
Payments of Merger Related Costs, Financing Activities	15.3
Amortization of acquisition-related financing expenses	$ 11.1