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Discontinued Operations (Narratives) (Details) - USD ($) $ in Millions |  | 6 Months Ended |
--- | --- | --- | ---
Apr. 11, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Mar. 31, 2017
Discontinued Operations |  |  |  |
Amortization of deferred tax asset |  | $ 0.6 |  |
Valuation allowance |  | 6.2 |  |
Exterran Corporation |  |  |  |
Discontinued Operations |  |  |  |
Unrecognized tax benefits |  | 6.4 |  |
Indemnification asset |  | 6.4 |  |
Exterran Corporation | Spinoff |  |  |  |
Discontinued Operations |  |  |  |
Compression units acquired |  |  | $ 79.3 |
Exterran Corporation |  |  |  |
Discontinued Operations |  |  |  |
Proceeds from sale of expropriated assets installment payment |  |  | $ 19.7 |
Scheduled installment payments |  | $ 20.9 |  |
Due from affiliate |  |  |  | $ 25.0
Proceeds from affiliate | $ 25.0 |  |  |

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