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Derivative Instruments, Hedging Activities and Fair Value Measurements, Nonrecurring Fair Value Measurements (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Asset Impairment Charges [Abstract]        
Asset impairment charges $ 13.5 $ 79.0 $ 15.2 $ 112.3
Impairment of other current assets     1.2  
Impairment of long-lived assets disposed of other than by sale     4.5 55.1
Impairment of long-lived assets held for sale     9.5 57.2 [1]
Impairment of long-lived assets     14.0  
NGL Pipelines & Services [Member]        
Asset Impairment Charges [Abstract]        
Asset impairment charges 2.2 5.2 2.6 6.0
Crude Oil Pipelines & Services [Member]        
Asset Impairment Charges [Abstract]        
Asset impairment charges 0.7 18.1 0.9 25.9
Natural Gas Pipelines & Services [Member]        
Asset Impairment Charges [Abstract]        
Asset impairment charges 9.7 0.8 9.7 21.5
Petrochemical & Refined Products Services [Member]        
Asset Impairment Charges [Abstract]        
Asset impairment charges 0.9 0.0 2.0 0.4
Offshore Pipelines & Services [Member]        
Asset Impairment Charges [Abstract]        
Asset impairment charges 0.0 54.9 0.0 58.5
Fair Value, Measurements, Nonrecurring [Member] | Long-lived Assets Disposed of Other Than By Sale [Member]        
Assets, Fair Value Disclosure [Abstract]        
Assets, fair value 0.0 0.0 0.0 0.0
Fair Value, Measurements, Nonrecurring [Member] | Long-lived Assets Held For Sale [Member]        
Assets, Fair Value Disclosure [Abstract]        
Assets, fair value 1.5 1,689.4 1.5 1,689.4
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member] | Long-lived Assets Disposed of Other Than By Sale [Member]        
Assets, Fair Value Disclosure [Abstract]        
Assets, fair value 0.0 0.0 0.0 0.0
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member] | Long-lived Assets Held For Sale [Member]        
Assets, Fair Value Disclosure [Abstract]        
Assets, fair value 0.0 0.0 0.0 0.0
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member] | Long-lived Assets Disposed of Other Than By Sale [Member]        
Assets, Fair Value Disclosure [Abstract]        
Assets, fair value 0.0 0.0 0.0 0.0
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member] | Long-lived Assets Held For Sale [Member]        
Assets, Fair Value Disclosure [Abstract]        
Assets, fair value 1.5 0.0 1.5 0.0
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Long-lived Assets Disposed of Other Than By Sale [Member]        
Assets, Fair Value Disclosure [Abstract]        
Assets, fair value 0.0 0.0 0.0 0.0
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Long-lived Assets Held For Sale [Member]        
Assets, Fair Value Disclosure [Abstract]        
Assets, fair value $ 0.0 $ 1,689.4 $ 0.0 $ 1,689.4
[1] Primarily represents the impairment charge recorded in second quarter of 2015 upon reclassification of our Offshore Business to held for sale status.