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Investments in Unconsolidated Affiliates (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]          
Investments in unconsolidated affiliates $ 2,669.4   $ 2,669.4   $ 2,628.5
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract]          
Equity in income (loss) of unconsolidated affiliates 76.4 $ 110.2 177.5 $ 199.4  
Unamortized excess cost amounts by business segment [Abstract]          
Unamortized excess cost amounts 45.8   45.8   46.9
Equity method investment amortization of excess cost 0.6 1.3 1.1 3.9  
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]          
Revenues 317.5 403.7 663.0 753.2  
Operating income 181.7 240.7 395.4 437.3  
Net income 178.3 237.7 393.5 431.1  
NGL Pipelines & Services [Member]          
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract]          
Equity in income (loss) of unconsolidated affiliates 14.0 12.5 29.1 24.1  
Unamortized excess cost amounts by business segment [Abstract]          
Unamortized excess cost amounts $ 24.7   $ 24.7   25.3
NGL Pipelines & Services [Member] | Venice Energy Service Company, L.L.C. [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership Interest (in hundredths) 13.10%   13.10%    
Investments in unconsolidated affiliates $ 25.4   $ 25.4   25.9
NGL Pipelines & Services [Member] | K/D/S Promix, L.L.C. [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership Interest (in hundredths) 50.00%   50.00%    
Investments in unconsolidated affiliates $ 38.3   $ 38.3   38.3
NGL Pipelines & Services [Member] | Baton Rouge Fractionators LLC [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership Interest (in hundredths) 32.20%   32.20%    
Investments in unconsolidated affiliates $ 17.4   $ 17.4   18.5
NGL Pipelines & Services [Member] | Skelly-Belvieu Pipeline Company, L.L.C. [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership Interest (in hundredths) 50.00%   50.00%    
Investments in unconsolidated affiliates $ 39.2   $ 39.2   39.8
NGL Pipelines & Services [Member] | Texas Express Pipeline LLC [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership Interest (in hundredths) 35.00%   35.00%    
Investments in unconsolidated affiliates $ 335.3   $ 335.3   342.0
NGL Pipelines & Services [Member] | Texas Express Gathering LLC [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership Interest (in hundredths) 45.00%   45.00%    
Investments in unconsolidated affiliates $ 36.4   $ 36.4   36.8
NGL Pipelines & Services [Member] | Front Range Pipeline LLC [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership Interest (in hundredths) 33.30%   33.30%    
Investments in unconsolidated affiliates $ 170.4   $ 170.4   171.2
NGL Pipelines & Services [Member] | Delaware Basin Gas Processing LLC [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership Interest (in hundredths) 50.00%   50.00%    
Investments in unconsolidated affiliates $ 83.3   $ 83.3   46.2
Crude Oil Pipelines & Services [Member]          
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract]          
Equity in income (loss) of unconsolidated affiliates 65.8 79.4 155.9 139.3  
Unamortized excess cost amounts by business segment [Abstract]          
Unamortized excess cost amounts $ 18.9   $ 18.9   19.3
Crude Oil Pipelines & Services [Member] | Seaway Crude Pipeline Company LLC [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership Interest (in hundredths) 50.00%   50.00%    
Investments in unconsolidated affiliates $ 1,400.1   $ 1,400.1   1,396.0
Crude Oil Pipelines & Services [Member] | Eagle Ford Pipeline LLC [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership Interest (in hundredths) 50.00%   50.00%    
Investments in unconsolidated affiliates $ 382.6   $ 382.6   388.8
Crude Oil Pipelines & Services [Member] | Eagle Ford Terminals Corpus Christi LLC [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership Interest (in hundredths) 50.00%   50.00%    
Investments in unconsolidated affiliates $ 44.5   $ 44.5   28.6
Natural Gas Pipelines & Services [Member]          
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract]          
Equity in income (loss) of unconsolidated affiliates $ 0.9 1.0 $ 1.9 1.9  
Natural Gas Pipelines & Services [Member] | White River Hub, LLC [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership Interest (in hundredths) 50.00%   50.00%    
Investments in unconsolidated affiliates $ 22.0   $ 22.0   22.5
Petrochemical & Refined Products Services [Member]          
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract]          
Equity in income (loss) of unconsolidated affiliates (4.3) (3.7) (9.4) (7.1)  
Unamortized excess cost amounts by business segment [Abstract]          
Unamortized excess cost amounts $ 2.2   $ 2.2   2.3
Petrochemical & Refined Products Services [Member] | Baton Rouge Propylene Concentrator, LLC [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership Interest (in hundredths) 30.00%   30.00%    
Investments in unconsolidated affiliates $ 5.0   $ 5.0   5.4
Petrochemical & Refined Products Services [Member] | Centennial Pipeline LLC [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership Interest (in hundredths) 50.00%   50.00%    
Investments in unconsolidated affiliates $ 63.2   $ 63.2   65.6
Petrochemical & Refined Products Services [Member] | Other Unconsolidated Affiliates [Member]          
Schedule of Equity Method Investments [Line Items]          
Investments in unconsolidated affiliates 6.3   6.3   $ 2.9
Offshore Pipelines & Services [Member]          
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract]          
Equity in income (loss) of unconsolidated affiliates $ 0.0 $ 21.0 $ 0.0 $ 41.2