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Summary Of Significant Accounting Policies (Narrative) (Details) $ / shares in Units, $ in Millions	1 Months Ended									3 Months Ended		9 Months Ended
	Nov. 30, 2015 $ / shares	Aug. 31, 2015 $ / shares	May. 31, 2015 $ / shares	Mar. 31, 2015	Feb. 28, 2015 $ / shares	Nov. 30, 2014 $ / shares	Aug. 31, 2014 $ / shares	May. 31, 2014 $ / shares	Feb. 28, 2014 $ / shares	Oct. 31, 2015 $ / shares	Nov. 01, 2014 USD ($) $ / shares	Oct. 31, 2015 USD ($) $ / shares	Nov. 01, 2014 USD ($) $ / shares	Jan. 31, 2015 USD ($)
Summary of Significant Accounting Policies [Line Items]
Stock split, conversion ratio				2
Cash dividends declared per share (in dollars per share) \| $ / shares		$ 0.1175	$ 0.1175		$ 0.1175	$ 0.10	$ 0.10	$ 0.10	$ 0.1	$ 0.1175	$ 0.1000	$ 0.3525	$ 0.3000
Property, Plant and Equipment [Member]
Summary of Significant Accounting Policies [Line Items]
Property and equipment purchased but not yet paid												$ 9.2	$ 18.9
Subsequent Event [Member]
Summary of Significant Accounting Policies [Line Items]
Cash dividends declared per share (in dollars per share) \| $ / shares	$ 0.1175
New Accounting Pronouncement, Early Adoption, Effect [Member] \| Other Assets [Member]
Summary of Significant Accounting Policies [Line Items]
Deferred Finance Costs, Net											$ (2.4)		(2.4)	$ (2.8)
New Accounting Pronouncement, Early Adoption, Effect [Member] \| Long-term Debt [Member]
Summary of Significant Accounting Policies [Line Items]
Deferred Finance Costs, Net											$ 2.4		$ 2.4	$ 2.8