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Discontinued Operations (Narratives) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Exterran Corporation |  |
Discontinued Operations |  |
Unrecognized tax benefits | $ 6.4 |
Indemnification asset | 6.4 |
Exterran Corporation | Spinoff |  |
Discontinued Operations |  |
Compression units acquired | 37.8 | $ 37.2
Exterran Corporation |  |
Discontinued Operations |  |
Proceeds from sale of expropriated assets installment payment |  | $ 19.7
Scheduled installment payments | $ 20.9 |

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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