Guarantee of Securities of Subsidiaries (Tables)

3 Months Ended

Mar. 31, 2013

Condensed Financial Information of Parent Company Only Disclosure [Abstract]

Condensed Consolidating Balance Sheets as of March 31, 2013

(Millions)



Assets	Parent Guarantor		Subsidiary Issuer		Non-guarantor Subsidiaries		Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Cash and cash equivalents	$	—	$	2.0	$	2.3	$	—		$	4.3
Receivables	—		—		116.3		(7.0		)	109.3
Gas stored underground	—		—		0.9		—			0.9
Prepayments	0.4		—		11.3		—			11.7
Other current assets	0.2		—		20.6		(6.8		)	14.0
Total current assets	0.6		2.0		151.4		(13.8		)	140.2
Investment in consolidated subsidiaries	1,343.9		5,911.7		—		(7,255.6		)	—
Property, plant and equipment, gross	0.6		0.3		8,469.6		—			8,470.5
Less–accumulated depreciation and amortization	0.6		—		1,282.8		—			1,283.4
Property, plant and equipment, net	—		0.3		7,186.8		—			7,187.1
Other noncurrent assets	0.1		4.5		512.0		—			516.6
Advances to affiliates – noncurrent	2,519.4		115.7		775.3		(3,410.4		)	—
Total other assets	2,519.5		120.2		1,287.3		(3,410.4		)	516.6

Total Assets	$	3,864.0	$	6,034.2	$	8,625.5	$	(10,679.8	)	$	7,843.9



Liabilities & Partners' Capital/Member’s Equity	Parent Guarantor		Subsidiary Issuer		Non-guarantor Subsidiaries		Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Payables	$	0.5	$	0.2	$	66.9	$	(7.0	)	$	60.6
Payable to affiliates	3.0		—		—		—			3.0
Other current liabilities	0.4		16.3		119.9		(6.8		)	129.8
Total current liabilities	3.9		16.5		186.8		(13.8		)	193.4
Total long-term debt	—		1,379.1		2,228.6		—			3,607.7
Payable to affiliate	16.0		3,294.7		115.7		(3,410.4		)	16.0
Other noncurrent liabilities	—		—		182.7		—			182.7
Total other liabilities and deferred credits	16.0		3,294.7		298.4		(3,410.4		)	198.7
Total partners’ capital/member’s equity	3,844.1		1,343.9		5,911.7		(7,255.6		)	3,844.1

Total Liabilities and Partners' Capital/Member’s Equity	$	3,864.0	$	6,034.2	$	8,625.5	$	(10,679.8	)	$	7,843.9

Condensed Consolidating Balance Sheets as of December 31, 2012

(Millions)



Assets	Parent Guarantor		Subsidiary Issuer		Non-guarantor Subsidiaries		Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Cash and cash equivalents	$	0.1	$	1.0	$	2.8	$	—		$	3.9
Receivables	—		—		119.5		(7.3		)	112.2
Gas stored underground	—		—		7.0		—			7.0
Prepayments	—		—		15.2		—			15.2
Advances to affiliates	—		—		2.0		(2.0		)	—
Other current assets	0.4		—		18.1		(3.6		)	14.9
Total current assets	0.5		1.0		164.6		(12.9		)	153.2
Investment in consolidated subsidiaries	1,257.0		5,785.7		—		(7,042.7		)	—
Property, plant and equipment, gross	0.6		—		8,422.7		—			8,423.3
Less–accumulated depreciation and amortization	0.6		—		1,233.5		—			1,234.1
Property, plant and equipment, net	—		—		7,189.2		—			7,189.2
Other noncurrent assets	0.1		4.8		515.2		—			520.1
Advances to affiliates – noncurrent	2,638.5		84.4		582.6		(3,305.5		)	—
Total other assets	2,638.6		89.2		1,097.8		(3,305.5		)	520.1

Total Assets	$	3,896.1	$	5,875.9	$	8,451.6	$	(10,361.1	)	$	7,862.5



Liabilities & Partners' Capital/Member’s Equity	Parent Guarantor		Subsidiary Issuer		Non-guarantor Subsidiaries		Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Payables	$	0.1	$	—	$	96.2	$	(7.3	)	$	89.0
Payable to affiliates	2.7		2.0		—		(2.0		)	2.7
Other current liabilities	0.2		16.9		150.4		(3.4		)	164.1
Total current liabilities	3.0		18.9		246.6		(12.7		)	255.8
Total long-term debt	—		1,378.9		2,160.3		—			3,539.2
Payable to affiliate	16.0		3,221.1		84.4		(3,305.5		)	16.0
Other noncurrent liabilities	—		—		174.6		(0.2		)	174.4
Total other liabilities and deferred credits	16.0		3,221.1		259.0		(3,305.7		)	190.4
Total partners’ capital/member’s equity	3,877.1		1,257.0		5,785.7		(7,042.7		)	3,877.1

Total Liabilities and Partners' Capital/Member’s Equity	$	3,896.1	$	5,875.9	$	8,451.6	$	(10,361.1	)	$	7,862.5

Condensed Consolidating Statements of Income

Condensed Consolidating Statements of Income for the Three Months Ended March 31, 2013

(Millions)



	Parent Guarantor			Subsidiary Issuer			Non-guarantor Subsidiaries			Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Operating Revenues:
Transportation	$	—		$	—		$	305.8		$	(21.7	)	$	284.1
Parking and lending	—			—			7.9			—			7.9
Storage	—			—			28.2			(0.1		)	28.1
Other	—			—			8.4			—			8.4
Total operating revenues	—			—			350.3			(21.8		)	328.5

Operating Cost and Expenses:
Fuel and gas transportation	—			—			44.5			(21.8		)	22.7
Operation and maintenance	—			—			40.2			—			40.2
Administrative and general	—			—			31.4			—			31.4
Other operating costs and expenses	—			—			92.5			—			92.5
Total operating costs and expenses	—			—			208.6			(21.8		)	186.8
Operating income	—			—			141.7			—			141.7

Other Deductions (Income):
Interest expense	—			17.2			23.3			—			40.5
Interest expense, affiliate, net	(8.4		)	10.3			(1.9		)	—			—
Interest income	—			—			(0.2		)	—			(0.2		)
Equity in earnings of subsidiaries	(93.0		)	(120.5		)	—			213.5			—
Miscellaneous other income	—			—			(0.2		)	—			(0.2		)
Total other (income) deductions	(101.4		)	(93.0		)	21.0			213.5			40.1

Income before income taxes	101.4			93.0			120.7			(213.5		)	101.6
Income taxes	—			—			0.2			—			0.2

Net Income	$	101.4		$	93.0		$	120.5		$	(213.5	)	$	101.4

Condensed Consolidating Statements of Income for the Three Months Ended March 31, 2012

(Millions)



	Parent Guarantor			Subsidiary Issuer			Non-guarantor Subsidiaries			Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Operating Revenues:
Transportation	$	—		$	—		$	309.3		$	(21.8	)	$	287.5
Parking and lending	—			—			4.0			—			4.0
Storage	—			—			19.8			—			19.8
Other	—			—			1.6			—			1.6
Total operating revenues	—			—			334.7			(21.8		)	312.9

Operating Cost and Expenses:
Fuel and gas transportation	—			—			40.5			(21.8		)	18.7
Operation and maintenance	—			—			37.6			—			37.6
Administrative and general	—			—			34.2			—			34.2
Other operating costs and expenses	—			—			88.8			—			88.8
Total operating costs and expenses	—			—			201.1			(21.8		)	179.3
Operating income	—			—			133.6			—			133.6

Other Deductions (Income):
Interest expense	—			15.9			23.1			—			39.0
Interest expense, affiliate, net	(9.2		)	13.6			(2.4		)	—			2.0
Interest income	—			—			(0.1		)	—			(0.1		)
Equity in earnings of subsidiaries	(83.4		)	(112.9		)	—			196.3			—
Miscellaneous other income	—			—			(0.1		)	—			(0.1		)
Total other (income) deductions	(92.6		)	(83.4		)	20.5			196.3			40.8

Income before income taxes	92.6			83.4			113.1			(196.3		)	92.8
Income taxes	—			—			0.2			—			0.2

Net Income	$	92.6		$	83.4		$	112.9		$	(196.3	)	$	92.6

Condensed Consolidating Statements Of Comprehensive Income

Condensed Consolidating Statements of Comprehensive Income for the Three Months Ended March 31, 2013

(Millions)



	Parent Guarantor			Subsidiary Issuer			Non-guarantor Subsidiaries			Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Net Income	$	101.4		$	93.0		$	120.5		$	(213.5	)	$	101.4
Other comprehensive income (loss):
(Loss) gain on cash flow hedges	(4.5		)	(4.5		)	(4.5		)	9.0			(4.5		)
Reclassification adjustment transferred to Net Income from cash flow hedges	0.1			0.4			(0.3		)	(0.1		)	0.1
Pension and other postretirement benefit costs	(1.7		)	(1.7		)	(1.7		)	3.4			(1.7		)
Total Comprehensive Income	$	95.3		$	87.2		$	114.0		$	(201.2	)	$	95.3

Condensed Consolidating Statements of Comprehensive Income for the Three Months Ended March 31, 2012

(Millions)



	Parent Guarantor			Subsidiary Issuer			Non-guarantor Subsidiaries			Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Net Income	$	92.6		$	83.4		$	112.9		$	(196.3	)	$	92.6
Other comprehensive income (loss):
Gain (loss) on cash flow hedges	0.6			0.6			0.6			(1.2		)	0.6
Reclassification adjustment transferred to Net Income from cash flow hedges	0.4			0.4			—			(0.4		)	0.4
Pension and other postretirement benefit costs	(1.7		)	(1.7		)	(1.7		)	3.4			(1.7		)
Total Comprehensive Income	$	91.9		$	82.7		$	111.8		$	(194.5	)	$	91.9

Condensed Consolidating Statements of Cash Flows

Condensed Consolidating Statements of Cash Flow for the Three Months Ended March 31, 2013

(Millions)



	Parent Guarantor			Subsidiary Issuer			Non-guarantor Subsidiaries			Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Net Cash Provided by (Used In) Operating Activities	$	9.4		$	(27.0	)	$	146.9		$	—		$	129.3

Investing Activities:
Capital expenditures	—			(0.3		)	(70.3		)	—			(70.6		)
Proceeds from sale of operating assets	—			—			1.0			—			1.0
Proceeds from insurance and other recoveries	—			—			1.4			—			1.4
Advances to affiliates, net	119.2			(31.3		)	(190.8		)	102.9			—
Investment in consolidated subsidiary	—			(12.0		)	—			12.0			—
Net Cash (Used in) Provided by Investing Activities	119.2			(43.6		)	(258.7		)	114.9			(68.2		)

Financing Activities:
Proceeds from borrowings on revolving credit agreement	—			—			263.0			—			263.0
Repayment of borrowings on revolving credit agreement	—			—			(195.0		)	—			(195.0		)
Contribution from parent	—			—			12.0			(12.0		)	—
Advances from affiliates, net	(0.4		)	71.6			31.3			(102.9		)	(0.4		)
Distributions paid	(128.3		)	—			—			—			(128.3		)
Net Cash Provided by (Used in) Financing Activities	(128.7		)	71.6			111.3			(114.9		)	(60.7		)

(Decrease) increase in Cash and Cash Equivalents	(0.1		)	1.0			(0.5		)	—			0.4
Cash and Cash Equivalents at Beginning of Period	0.1			1.0			2.8			—			3.9
Cash and Cash Equivalents at End of Period	$	—		$	2.0		$	2.3		$	—		$	4.3

Condensed Consolidating Statements of Cash Flow for the Three Months Ended March 31, 2012

(Millions)



	Parent Guarantor			Subsidiary Issuer			Non-guarantor Subsidiaries			Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Net Cash Provided by (Used In) Operating Activities	$	8.0		$	29.8		$	131.7		$	(59.7	)	$	109.8

Investing Activities:
Capital expenditures	—			—			(26.0		)	—			(26.0		)
Proceeds from sale of operating assets	—			—			1.7			—			1.7
Proceeds from insurance and other recoveries	—			—			0.4			—			0.4
Advances to affiliates, net	(134.0		)	(4.1		)	(102.1		)	240.2			—
Investment in consolidated subsidiary	(15.4		)	(15.4		)	—			30.8			—
Net Cash Provided by (Used in) Investing Activities	(149.4		)	(19.5		)	(126.0		)	271.0			(23.9		)

Financing Activities:
Proceeds from borrowings on revolving credit agreement	—			180.0			190.0			—			370.0
Repayment of borrowings on revolving credit agreement	—			(165.0		)	(165.0		)	—			(330.0		)
Contribution from parent	—			15.4			15.4			(30.8		)	—
Advances from affiliates, net	4.7			235.3			4.9			(240.2		)	4.7
Repayment of contribution received related to predecessor equity	—			(284.8		)	—			—			(284.8		)
Distributions paid	(114.0		)	—			(59.7		)	59.7			(114.0		)
Proceeds from sale of common units	245.0			—			—			—			245.0
Capital contribution from general partner	5.2			—			—			—			5.2
Net Cash (Used in) Provided by Financing Activities	140.9			(19.1		)	(14.4		)	(211.3		)	(103.9		)

Decrease in Cash and Cash Equivalents	(0.5		)	(8.8		)	(8.7		)	—			(18.0		)
Cash and Cash Equivalents at Beginning of Period	0.5			10.7			10.7			—			21.9
Cash and Cash Equivalents at End of Period	$	—		$	1.9		$	2.0		$	—		$	3.9