Partners' Equity and Cash Distributions (Schedule of Cash Distributions) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
 [1]
Equity [Abstract]        
Distribution Made to Limited Partner, Date of Record Feb. 11, 2016 Nov. 13, 2015 Aug. 13, 2015 May 13, 2015
Distribution Made to Limited Partner, Distribution Date Feb. 19, 2016 Nov. 20, 2015 Aug. 20, 2015 May 20, 2015
Distribution Made to Limited Partner, Distributions Declared, Per Unit $ 0.1800 $ 0.1725 $ 0.1675 $ 0.0912
Distribution Made to Limited Partner, Cash Distributions Paid $ 18.1 $ 17.4 $ 16.9 $ 9.2
[1] The quarterly distribution for three months ended March 31, 2015 was prorated for the period beginning immediately after the closing of the IPO, February 11, 2015 through March 31, 2015.