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Intangible Assets and Goodwill, Significant Intangible Assets (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Customer relationship intangibles [Member]
Dec. 31, 2013
Customer relationship intangibles [Member]
State Line Gathering [Member]
Dec. 31, 2013
Customer relationship intangibles [Member]
Fairplay Gathering [Member]
Dec. 31, 2013
Customer relationship intangibles [Member]
Fairplay Processing [Member]
Dec. 31, 2013
Customer relationship intangibles [Member]
State Line and Fairplay [Member]
Dec. 31, 2013
Customer relationship intangibles [Member]
San Juan Gathering [Member]
Dec. 31, 2013
Customer relationship intangibles [Member]
Offshore Pipelines and Platforms [Member]
Dec. 31, 2013
Customer relationship intangibles [Member]
Offshore Pipelines and Platforms [Member]
Minimum [Member]
Dec. 31, 2013
Customer relationship intangibles [Member]
Offshore Pipelines and Platforms [Member]
Maximum [Member]
Dec. 31, 2013
Customer relationship intangibles [Member]
Encinal [Member]
Dec. 31, 2013
Contract-based intangibles [Member]
Dec. 31, 2013
Contract-based intangibles [Member]
San Juan Gathering [Member]
Dec. 31, 2013
Contract-based intangibles [Member]
Jonah Gas Gathering [Member]
Dec. 31, 2013
Contract-based intangibles [Member]
Shell Processing Agreement [Member]
Identifiable intangible assets [Abstract]                                  
Gross Value $ 2,612.2 $ 2,616.8     $ 675.0 [1] $ 116.6 [1] $ 103.4 [2] $ 895.0                  
Accumulated Amortization (1,150.0) (1,050.0)     (62.2) [1] (24.2) [1] (21.5) [2] (107.9)                  
Carrying Value $ 1,462.2 $ 1,566.8 $ 1,656.2 $ 1,180.0 $ 612.8 [1] $ 92.4 [1] $ 81.9 [2] $ 787.1 $ 159.7 $ 53.9     $ 56.9 $ 280.3 $ 44.9 $ 89.4 $ 61.7
Finite-Lived Intangible Asset, Useful Life         27 years 23 years 23 years   35 years   11 years 33 years 20 years   20 years 40 years 20 years
[1] These natural gas gathering customer relationship intangible assets are a component of our Onshore Natural Gas Pipelines & Services business segment.
[2] The Fairplay natural gas processing customer relationship intangible assets are a component of our NGL Pipelines & Services business segment.