CONSOLIDATED STATEMENT OF CASH FLOWS (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Cash Generated From Operations
Net income	$ 157.4	[1],[2]	$ 137.1	[1]	$ 106.1	[1],[3]
Depreciation	15.2		15.0		14.7
Amortization of debt issue costs (Note 8)	2.0		0.5		0.4
(Decrease)/increase in other long-term liabilities	(0.9)		0.6		0.3
Equity allowance for funds used during construction			(0.3)		(0.5)
(Increase)/decrease in operating working capital (Note 11)	(3.0)		3.1		2.5
Total cash generated from operations	169.2		156.0		123.5
Investing Activities
Capital expenditures	(3.5)		(9.3)		(1.9)
Increase in investing working capital (Note 11)					(2.9)
Total investing activities	(547.8)		10.6		(269.8)
Financing Activities
Distributions paid (Note 10)	(154.8)		(138.7)		(117.0)
Equity issuances, net	337.6				265.6
Long-term debt issued (Note 6)	894.4		74.0		208.0
Long-term debt repaid (Note 6)	(665.8)		(101.4)		(203.5)
Debt issue costs	(6.9)
Total financing activities	404.5		(166.1)		141.0
Increase/(decrease) in cash and cash equivalents	25.9		0.5		(5.3)
Cash and cash equivalents, beginning of year	3.6		3.1		8.4
Cash and cash equivalents, end of year	29.5		3.6		3.1
Interest payments made	13.1		8.5		16.5
GTN and Bison
Investing Activities
Acquisition	(538.7)
GTN
Investing Activities
Cumulative distributions in excess of equity earnings:	21.1	[2]
Bison
Cash Generated From Operations
Equity earnings in excess of cumulative distributions:	(1.5)	[2]
Great Lakes
Investing Activities
Cumulative distributions in excess of equity earnings:	13.4		10.5		13.4
Investment	(8.9)		(9.3)		(0.1)
Northern Border
Investing Activities
Cumulative distributions in excess of equity earnings:	23.6		18.7		35.4
Investment	(54.8)				(42.3)
North Baja Pipeline, LLC
Investing Activities
Acquisition					(271.4)
Financing Activities
Due to North Baja's former parent (Note 6)					$ (12.1)

[1] Recast as discussed in Notes 2 and 5 and includes equity earnings from GTN and Bison from May 3, 2011, date of acquisition, to December 31, 2011.

[2] Includes equity earnings from GTN and Bison from May 3, 2011, date of acquisition, to December 31, 2011.

[3] Recast as discussed in Notes 2 and 5.