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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.