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Discontinued Operations (Narratives) (Details) - USD ($) $ in Millions		9 Months Ended
	Apr. 11, 2017	Sep. 30, 2018	Sep. 30, 2017	Mar. 31, 2017
Discontinued Operations
Amortization of deferred tax asset		$ 0.9
Valuation allowance		5.9
Exterran Corporation
Discontinued Operations
Unrecognized tax benefits		6.4
Indemnification asset		6.4
Exterran Corporation | Spinoff
Discontinued Operations
Compression units acquired			$ 115.3
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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