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Joint Ventures and Other Equity Investments (Purchases of Compressors) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Equity Method Investments and Joint Ventures [Abstract] |  |  |
Purchases of compressors from joint venture | $ 106.4 | $ 97.7 | $ 103.5

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- Definition Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References No definition available. + Details
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