Statements of Consolidated and Combined Comprehensive Income - USD ($)
$ in Millions
 1 Months Ended 2 Months Ended 3 Months Ended
Feb. 11, 2015
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Net Income $ 42.7 $ 88.5 $ 180.2 $ 131.2
Net unrealized gain on cash flow hedges [1]     0.5 0.2
Other Comprehensive Income, Net of Tax and Transaction Adjustments     0.5 0.2
Total other comprehensive income 0.1 0.1 0.5 [2] 0.1 [3]
Total comprehensive income subsequent to IPO $ 42.8 $ 88.6 180.7 131.4
Less: Comprehensive income attributable to noncontrolling interest subsequent to IPO     153.3 75.3
Comprehensive income attributable to limited partners subsequent to IPO     $ 27.4 $ 13.3
[1] Net unrealized gains on derivatives qualifying as cash flow hedges, net of zero and $0.1 million tax expense for the three months ended March 31, 2016 and 2015, respectively
[2] Amounts in parentheses indicate debits.
[3] All amounts prior to the IPO are net of tax. Amounts in parentheses indicate debits.