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Investments in Unconsolidated Affiliates (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]      
Investments in unconsolidated affiliates $ 2,600.2 $ 2,615.1 $ 2,659.4
Non-cash asset impairment charge of unconsolidated affiliate 76.4    
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract]      
Equity in income (loss) of unconsolidated affiliates 563.0 480.0 426.0
Unamortized excess cost amounts by business segment:      
Unamortized excess cost amounts 37.1 40.8  
Equity method investment amortization of excess cost 2.1 2.1 2.1
Forecasted amortization of excess cost amounts - 2020 2.0    
Forecasted amortization of excess cost amounts - 2021 2.0    
Forecasted amortization of excess cost amounts - 2022 2.0    
Forecasted amortization of excess cost amounts - 2023 2.0    
Forecasted amortization of excess cost amounts - 2024 2.0    
Balance Sheet Data:      
Current assets 358.1 350.2  
Property, plant and equipment, net 5,379.7 5,359.1  
Other assets 68.7 80.4  
Total assets 5,806.5 5,789.7  
Current liabilities 230.9 220.6  
Other liabilities 69.6 77.9  
Combined equity 5,506.0 5,491.2  
Total liabilities and combined equity 5,806.5 5,789.7  
Income Statement Data:      
Revenues 1,950.2 1,721.3 1,509.0
Operating income 1,250.4 1,074.6 925.9
Net income 1,251.8 1,069.1 929.5
NGL Pipelines & Services [Member]      
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract]      
Equity in income (loss) of unconsolidated affiliates 114.5 117.0 73.4
Unamortized excess cost amounts by business segment:      
Unamortized excess cost amounts $ 20.5 21.7  
NGL Pipelines & Services [Member] | Venice Energy Service Company, L.L.C. [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership interest 13.10%    
Investments in unconsolidated affiliates $ 23.2 24.1  
NGL Pipelines & Services [Member] | K/D/S Promix, L.L.C. [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership interest 50.00%    
Investments in unconsolidated affiliates $ 25.7 28.9  
NGL Pipelines & Services [Member] | Baton Rouge Fractionators LLC [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership interest 32.20%    
Investments in unconsolidated affiliates $ 15.6 16.3  
NGL Pipelines & Services [Member] | Skelly-Belvieu Pipeline Company, L.L.C. [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership interest 50.00%    
Investments in unconsolidated affiliates $ 33.1 35.6  
NGL Pipelines & Services [Member] | Texas Express Pipeline LLC [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership interest 35.00%    
Investments in unconsolidated affiliates $ 358.1 337.6  
NGL Pipelines & Services [Member] | Texas Express Gathering LLC [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership interest 45.00%    
Investments in unconsolidated affiliates $ 41.1 43.6  
NGL Pipelines & Services [Member] | Front Range Pipeline LLC [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership interest 33.30%    
Investments in unconsolidated affiliates $ 207.0 175.9  
Crude Oil Pipelines & Services [Member]      
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract]      
Equity in income (loss) of unconsolidated affiliates 449.2 365.4 358.4
Unamortized excess cost amounts by business segment:      
Unamortized excess cost amounts $ 16.6 17.4  
Crude Oil Pipelines & Services [Member] | Seaway Crude Holdings LLC [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership interest 50.00%    
Investments in unconsolidated affiliates $ 1,353.1 1,369.7  
Crude Oil Pipelines & Services [Member] | Eagle Ford Pipeline LLC [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership interest 50.00%    
Investments in unconsolidated affiliates $ 386.5 388.7  
Crude Oil Pipelines & Services [Member] | Eagle Ford Terminals Corpus Christi LLC [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership interest 50.00%    
Investments in unconsolidated affiliates $ 126.9 109.1  
Natural Gas Pipelines & Services [Member]      
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract]      
Equity in income (loss) of unconsolidated affiliates $ 6.3 6.8 3.8
Natural Gas Pipelines & Services [Member] | White River Hub, LLC [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership interest 50.00%    
Investments in unconsolidated affiliates $ 19.1 20.1  
Natural Gas Pipelines & Services [Member] | Old Ocean Pipeline, LLC [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership interest 50.00%    
Investments in unconsolidated affiliates $ 8.2 2.7  
Petrochemical & Refined Products Services [Member]      
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract]      
Equity in income (loss) of unconsolidated affiliates [1] (7.0) (9.2) $ (9.6)
Unamortized excess cost amounts by business segment:      
Unamortized excess cost amounts $ 0.0 1.7  
Petrochemical & Refined Products Services [Member] | Centennial Pipeline LLC [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership interest 50.00%    
Investments in unconsolidated affiliates [2] $ 0.0 59.1  
Non-cash asset impairment charge of unconsolidated affiliate $ 76.4    
Petrochemical & Refined Products Services [Member] | Baton Rouge Propylene Concentrator, LLC [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership interest 30.00%    
Investments in unconsolidated affiliates $ 2.0 3.2  
Petrochemical & Refined Products Services [Member] | Transport 4, LLC [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership interest 25.00%    
Investments in unconsolidated affiliates $ 0.6 $ 0.5  
[1]
The losses recorded for this segment are primarily due to protection, maintenance and pipeline integrity costs of the idled Centennial Pipeline, which was purged and filled with nitrogen in 2013.  Although we wrote off our investment in Centennial in 2019, we, as a 50% owner of Centennial, have a continuing obligation to fund the pipeline’s costs in its idled state.
[2] The investment in Centennial was written off in December 2019.