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Acquisitions - Book Value of Assets Acquired (Details) - USD ($)
$ in Millions
May 23, 2016
May 18, 2016
May 18, 2015
May 2016 Acquisition      
Business Acquisition [Line Items]      
Cost investment $ 5.2    
Equity method investments 1.5    
Partners capital 87.0    
Book value of assets acquired $ 93.7    
Colonial      
Business Acquisition [Line Items]      
Interest acquired 3.00%   1.388%
Zydeco      
Business Acquisition [Line Items]      
Interest acquired 30.00%   19.50%
Bengal      
Business Acquisition [Line Items]      
Interest acquired 1.00%    
May 2015 Acquisition      
Business Acquisition [Line Items]      
Cost investment     $ 2.5
Partners capital   $ 52.9  
Book value of assets acquired     $ 55.4