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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% |

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