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Investments in Non-Consolidated Affiliates (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Investments in Non-Consolidated Affiliates |  |  |  |
Installment payments, including annual charges, received from the sale of the joint venture | $ 4.9 | $ 4.7 | $ 9.8 | $ 9.4
Remaining principal amount due from sale of joint venture | $ 30 |  | $ 30 |
PIGAP II |  |  |  |
Ownership interest of each equity method investee |  |  |  |
Ownership Interest (as a percent) | 30.00% |  | 30.00% |
El Furrial |  |  |  |
Ownership interest of each equity method investee |  |  |  |
Ownership Interest (as a percent) | 33.30% |  | 33.30% |

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