Net Income Per Limited Partner Unit (Schedule of Net Income Per Limited Partner Unit) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
2 Months Ended
Mar. 31, 2015
Schedule Of Earnings Per Unit [Line Items]  
Incentive Distribution, Distribution $ 0
Partners' Capital Account, Distributions 0
Undistributed Earnings, Basic 13.3
Net Income (Loss) Allocated to Limited Partners 13.3
Weighted Average Number of Shares Outstanding, Basic and Diluted 100.6
Net Income (Loss), Per Outstanding Limited Partnership and General Partnership Unit, Basic and Diluted, Net of Tax $ 0.13
Incentive Distribution Rights [Member]  
Schedule Of Earnings Per Unit [Line Items]  
Incentive Distribution, Distribution 0
Undistributed Earnings, Basic 0
Net Income (Loss) Allocated to Limited Partners 0
Weighted Average Number of Shares Outstanding, Basic and Diluted 0
Net Income (Loss), Per Outstanding Limited Partnership and General Partnership Unit, Basic and Diluted, Net of Tax $ 0.00
Subordinated Units [Member]  
Schedule Of Earnings Per Unit [Line Items]  
Distribution Made to Limited Partner, Cash Distributions Declared 0
Undistributed Earnings, Basic 6.2
Net Income (Loss) Allocated to Limited Partners 6.2
Weighted Average Number of Shares Outstanding, Basic and Diluted 46.8
Net Income (Loss), Per Outstanding Limited Partnership and General Partnership Unit, Basic and Diluted, Net of Tax $ 0.13
Common Units [Member]  
Schedule Of Earnings Per Unit [Line Items]  
Distribution Made to Limited Partner, Cash Distributions Declared 0
Undistributed Earnings, Basic 7.1
Net Income (Loss) Allocated to Limited Partners $ 7.1
Weighted Average Number of Shares Outstanding, Basic and Diluted 53.8
Net Income (Loss), Per Outstanding Limited Partnership and General Partnership Unit, Basic and Diluted, Net of Tax $ 0.13