Financing (Tables)

9 Months Ended

Sep. 30, 2017

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments

For the nine months ended September 30, 2017 and 2016, the Partnership completed the following debt issuances (in millions, except interest rates):

Date of Issuance	Issuing Subsidiary	Amount of  Issuance		Purchaser Discounts and Expenses		Net Proceeds			Interest Rate	Maturity Date	Interest Payable
January 2017	Boardwalk Pipelines	$	500.0	$	6.0	$	494.0	(1)	4.45%	July 15, 2027	January 15 and July 15
May 2016	Boardwalk Pipelines	$	550.0	$	10.9	$	539.1	(2)	5.95%	June 1, 2026	June 1 and December 1

(1) The net proceeds of this offering were used to retire the outstanding $275.0 million aggregate principal amount of Gulf South's 6.30% notes due 2017 (Gulf South 2017 Notes) and to fund growth capital expenditures.

(2) The net proceeds of this offering were used to retire the outstanding $250.0 million aggregate principal amount of Boardwalk Pipelines 5.875% notes due 2016 and the outstanding $300.0 million aggregate principal amount of Boardwalk Pipelines 5.50% notes due 2017 at their maturity.