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Financing - Equity (Details) - USD ($)
shares in Millions, $ in Millions
9 Months Ended
Sep. 30, 2015
Oct. 31, 2016
Sep. 30, 2016
Capital Unit [Line Items]      
Percent of General Partner Interest Owned by Holding Company (in hundredths) 2.00%   2.00%
Equity Distribution Agreement      
Capital Unit [Line Items]      
Common units issued under an equity distribution agreement 7.0    
Proceeds from Issuance or Sale of Equity $ 115.4    
General Partners' Contributed Capital $ 2.3    
Percent of General Partner Interest Owned by Holding Company (in hundredths) 2.00%    
Subsequent Event      
Capital Unit [Line Items]      
Percent of General Partner Interest Owned by Holding Company (in hundredths)   2.00%