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Property, Plant and Equipment, Sale of Offshore Business (Details) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Dec. 31, 2014 | Jul. 24, 2015 USD ($)
Sale of Offshore Business [Abstract] |  |  |  |  |  |  |  |
Non-cash asset impairment charge | [1] |  |  |  | $ 55.0 |  |  |
Summary of depreciation expense and capitalized interest [Abstract] |  |  |  |  |  |  |  |
Depreciation expense | [2] | $ 286.2 | $ 283.2 |  | $ 870.1 | $ 822.1 |  |
Offshore Pipelines And Services [Member] |  |  |  |  |  |  |  |
Sale of Offshore Business [Abstract] |  |  |  |  |  |  |  |
Percentage of segment assets (in hundredths) |  |  |  | 0.041 |  |  | 0.043 |
Percentage of gross operating margin (in hundredths) |  |  |  | 0.034 |  |  | 0.031 |
Offshore Business [Member] |  |  |  |  |  |  |  |
Sale of Offshore Business [Abstract] |  |  |  |  |  |  |  |
Description of assets sold |  |  |  |  | As of December 31, 2014, our Offshore Business included approximately 2,350 miles of offshore natural gas and crude oil pipelines and six offshore hub platforms. |  |  |
Cash consideration received |  |  |  |  |  |  |  | $ 1,530.0
Non-cash asset impairment charge |  |  |  |  | $ 54.8 |  |  |
Loss on sale |  |  |  |  | 12.6 |  |  |
Sale of Offshore Business: |  |  |  |  |  |  |  |
Net assets of Offshore Business before impairment charge |  |  |  | $ 1,590.0 |  |  |  |
Current assets |  |  |  | 26.9 |  |  |  |
Property, plant and equipment, net |  |  |  | 1,140.0 |  |  |  |
Investments in unconsolidated affiliates |  |  |  | 482.4 |  |  |  |
Intangible assets, net |  |  |  | 37.1 |  |  |  |
Goodwill |  |  |  | 82.0 |  |  |  |
Total liabilities |  |  |  | 116.4 |  |  |  |
Noncontrolling interests in assets held for sale (See Note 6) |  |  |  | 62.2 |  |  |  |
Fair value of Offshore Business based on estimated transaction price |  |  |  | $ 1,530.0 |  |  |  |
Offshore Business [Member] | Offshore Business [Member] |  |  |  |  |  |  |  |
Summary of depreciation expense and capitalized interest [Abstract] |  |  |  |  |  |  |  |
Depreciation expense |  |  | $ 21.5 |  | $ 40.1 | $ 62.3 |  |
[1] | Primarily represents the impairment charge recorded in second quarter of 2015 upon reclassification of our Offshore Business to held for sale status.
[2] | Depreciation expense is a component of "Costs and expenses" as presented on our Unaudited Condensed Statements of Consolidated Operations.

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