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Investments in Non-Consolidated Affiliates (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Investments in non-consolidated affiliates        
Installment payments, including annual charges, received from the sale of the joint venture $ 5.1 $ 4.9 $ 10.1 $ 9.8
Remaining principal amount due from sale of joint venture $ 17.0   $ 17.0  
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%