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Financing - Debt (Details) - USD ($)
$ in Millions
1 Months Ended 9 Months Ended
May 31, 2016
Jun. 01, 2015
Feb. 01, 2015
Mar. 31, 2015
Sep. 30, 2016
Sep. 30, 2015
Oct. 28, 2016
Dec. 31, 2015
Debt Instruments [Abstract]                
Repayments of Unsecured Debt         $ 0.0 $ 725.0    
Unsecured Debt                
Debt Instruments [Abstract]                
Long-term Debt, Gross         $ 3,700.0     $ 3,100.0
Debt, Weighted-Average Interest Rate         5.46%     5.32%
Debt Instrument, Covenant Compliance         At September 30, 2016, Boardwalk Pipelines and its subsidiaries were in compliance with their debt covenants.      
Unsecured Debt | Boardwalk Pipelines 5.95% Notes Due 2026                
Debt Instruments [Abstract]                
Debt Instrument, Issuance Date May 31, 2016              
Debt Instrument, Face Amount $ 550.0              
Payments of Debt Issuance Costs 10.8              
Proceeds from Debt, Net of Issuance Costs [1] $ 539.1              
Debt Instrument, Interest Rate, Stated Percentage 5.95%              
Debt Instrument, Maturity Date Jun. 01, 2026              
Unsecured Debt | Boardwalk Pipelines 4.95% Notes Due 2024                
Debt Instruments [Abstract]                
Debt Instrument, Issuance Date       Mar. 31, 2015        
Debt Instrument, Face Amount       $ 250.0        
Payments of Debt Issuance Costs       2.9        
Proceeds from Debt, Net of Issuance Costs [2]       $ 247.1        
Debt Instrument, Interest Rate, Stated Percentage       4.95%        
Debt Instrument, Maturity Date       Dec. 15, 2024        
Unsecured Debt | Boardwalk Pipelines Notes Due 2016                
Debt Instruments [Abstract]                
Long-term Debt, Gross         $ 250.0      
Debt Instrument, Interest Rate, Stated Percentage         5.875%      
Unsecured Debt | Boardwalk Pipelines Notes Due 2017                
Debt Instruments [Abstract]                
Long-term Debt, Gross         $ 300.0      
Debt Instrument, Interest Rate, Stated Percentage         5.50%      
Unsecured Debt | Texas Gas Notes Due 2015                
Debt Instruments [Abstract]                
Repayments of Unsecured Debt   $ 250.0            
Debt Instrument, Interest Rate, Stated Percentage   4.60%            
Unsecured Debt | Gulf South Notes Due 2015                
Debt Instruments [Abstract]                
Repayments of Unsecured Debt     $ 275.0          
Debt Instrument, Interest Rate, Stated Percentage     5.05%          
Line of Credit                
Debt Instruments [Abstract]                
Debt, Weighted-Average Interest Rate               1.67%
Line of Credit Facility [Abstract]                
Long-term Line of Credit         $ 0.0     $ 375.0
Line of Credit Facility, Remaining Borrowing Capacity         $ 1,500.0      
Line of Credit Facility, Covenant Compliance         The Partnership and its subsidiaries were in compliance with all covenant requirements under the credit facility as of September 30, 2016.      
Line of Credit | Subsequent Event                
Line of Credit Facility [Abstract]                
Long-term Line of Credit             $ 0.0  
Line of Credit Facility, Remaining Borrowing Capacity             1,500.0  
Subordinated Debt                
Debt Instruments [Abstract]                
Debt Instrument, Maturity Date         Dec. 31, 2018      
Subordinated Loan Agreement Maximum Borrowing Capacity         $ 300.0      
Subordinated Debt         $ 0.0      
Subordinated Debt | Subsequent Event                
Debt Instruments [Abstract]                
Subordinated Debt             $ 0.0  
[1] The net proceeds of this offering will be used to retire the outstanding $250.0 million aggregate principal amount of Boardwalk Pipelines 5.875% notes due 2016 (Boardwalk Pipelines 2016 Notes) and the outstanding $300.0 million aggregate principal amount of Boardwalk Pipelines 5.50% notes due 2017 (Boardwalk Pipelines 2017 Notes). Initially, the Partnership used the net proceeds to reduce outstanding borrowings under its revolving credit facility. The Partnership expects to retire all of the outstanding aggregate principal amount of Boardwalk Pipelines 2016 Notes and Boardwalk Pipelines 2017 Notes, with borrowings under its revolving credit facility, at their maturity.
[2] The net proceeds of this offering were used to retire a portion of the outstanding $250.0 million aggregate principal amount of Texas Gas Transmission, LLC's (Texas Gas) 4.60% notes due 2015 (Texas Gas 2015 Notes). Initially, the Partnership used the net proceeds to reduce outstanding borrowings under its revolving credit facility. Subsequently, on June 1, 2015, the Partnership retired the Texas Gas 2015 Notes with borrowings under its revolving credit facility.