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Investments in Non-Consolidated Affiliates (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Investments in non-consolidated affiliates        
Installment payments, including annual charges, received from the sale of the joint venture $ 5.1 $ 5.0 $ 15.2 $ 14.7
Remaining principal amount due from sale of joint venture $ 13.0   $ 13.0  
PIGAP II        
Investments in non-consolidated affiliates        
Ownership interest (as a percent) 30.00%   30.00%  
El Furrial        
Investments in non-consolidated affiliates        
Ownership interest (as a percent) 33.30%   33.30%