Statements of Consolidated and Combined Balance Sheets (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Accounts receivable less reserve $ 0.3 $ 0.1
Common Units [Member]    
Limited Partners' Capital Account, Units Issued 53,833,107 0
Limited Partners' Capital Account, Units Outstanding 53,833,107 0
Subordinated Units [Member]    
Limited Partners' Capital Account, Units Issued 46,811,398 0
Limited Partners' Capital Account, Units Outstanding 46,811,398 0