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Equity Investees (Narrative) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Apr. 01, 2016 | Mar. 31, 2016
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Schedule of Equity Method Investments [Line Items] |  |  |  |
Unamortized excess cost amount | $ 366.4 | $ 382.4 |  |
Enterprise Offshore Acquisition | Deepwater Gateway LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity interest step up acquired percentage |  |  | 100.00% | 50.00%
Transaction costs related to business acquisition |  |  |  | $ 26.0

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- Definition Percentage of voting equity interests acquired in a business combination achieved in stages, including equity interests in the acquiree held by the acquirer immediately before the acquisition date and acquired at the acquisition date. + References No definition available. + Details
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- Definition Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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