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Investments in Non-Consolidated Affiliates (Details) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2012 | Jun. 30, 2013 | Jun. 30, 2013 | Dec. 31, 2012
Investments in Non-Consolidated Affiliates |  |  |  |
Initial payment received from the sale of the joint venture | $ 37.6 |  |  |
Installment payments received from the sale of the joint venture |  | 4.7 | 9.4 | 14.1
Remaining principal amount due from sale of joint venture |  | $ 48 | $ 48 |
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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