Subsequent Events (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		0 Months Ended	3 Months Ended	1 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Aug. 05, 2014 Subsequent Event [Member]	Jun. 30, 2014 Agreement Expiring in July 2015 [Member]	Jul. 31, 2014 Agreement Expiring in July 2015 [Member] Subsequent Event [Member]
Subsequent Event [Line Items]
Dividends payable, date declared			Aug. 05, 2014
Dividends declared per common share	$ 0.55	$ 0.48	$ 0.55
Dividends payable, date to be paid			Sep. 30, 2014
Dividends payable, date of record			Sep. 15, 2014
Money market loans maximum amount allowed				$ 35
Money market advances agreement expiration					Jul. 31, 2015