Investments in Non-Consolidated Affiliates (Details) - USD ($) $ in Millions |
1 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
Mar. 31, 2012 |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Archrock | ||||
| Schedule of Equity Method Investments [Line Items] | ||||
| Cash transferred to Archrock pursuant to the separation and distribution agreement | $ 10.4 | |||
| PIGAP II | ||||
| Schedule of Equity Method Investments [Line Items] | ||||
| Ownership Interest (as a percent) | 30.00% | |||
| El Furrial | ||||
| Schedule of Equity Method Investments [Line Items] | ||||
| Ownership Interest (as a percent) | 33.30% | |||
| Venezuela | ||||
| Schedule of Equity Method Investments [Line Items] | ||||
| Initial payment received | $ 37.6 | |||
| Installment payments, including annual charges | $ 10.4 | $ 15.2 | $ 14.7 | |
| Remaining principal amount due | $ 4.0 | |||