Subsequent Events (Cash Distribution) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	1 Months Ended				3 Months Ended					1 Months Ended
	May 31, 2014	Apr. 30, 2014	Feb. 28, 2014	Jan. 31, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Jul. 24, 2014 Subsequent Event Cash Distribution Declared	Jul. 24, 2014 Subsequent Event Cash Distribution Paid	Jul. 24, 2014 Subsequent Event General Partners’ Interest Cash Distribution Paid	Jul. 24, 2014 Subsequent Event Preferred Partner Cash Distribution Paid
Subsequent Event [Line Items]
Distribution Made to Limited Partner, Declaration Date										Jul. 24, 2014
Distribution Made to Limited Partner, Distributions Declared, Per Unit	$ 0.1933	$ 0.1933	$ 0.1933	$ 0.1933	$ 0.1933	$ 0.5800	$ 0.5600	$ 0.5400	$ 0.5100	$ 0.1966
Distribution Made to Limited Partner, Cash Distributions Paid											$ 18.9	$ 1.4	$ 1.5
Distribution Made to Member or Limited Partner, Distribution Date											Aug. 14, 2014
Distribution Made to Member or Limited Partner, Date of Record											Aug. 06, 2014