Shareholders' Equity (Schedule Of Dividends Paid) (Details) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended				3 Months Ended
	Jan. 02, 2015	Mar. 31, 2016	Dec. 31, 2015	Oct. 31, 2015	Jul. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Dividends, Common Stock [Abstract]
Dividends paid per common share						$ 0.26	$ 0.225
Common shares
Dividends, Common Stock [Abstract]
Dividends paid per common share		$ 0.26	$ 0.26	$ 0.26	$ 0.26
Payment of quarterly dividends	$ 23.4