CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Operating Activities:
Net Income	$ 25.6	$ 101.4
Adjustments to reconcile net income to cash provided by operations:
Depreciation and amortization	69.2	66.8
Amortization of deferred costs	1.5	1.3
Asset impairment	7.2	0.1
Net gain on sale of operating assets	(0.4)	0
Equity losses in unconsolidated affiliates	86.1	0
Changes in operating assets and liabilities:
Trade and other receivables	(5.0)	1.5
Other receivables, affiliates	0.4	0
Gas receivables and storage assets	(4.3)	6.8
Costs recoverable from customers	(0.4)	0.9
Other assets	4.2	2.4
Trade and other payables	(10.6)	(18.2)
Other payables, affiliates	(1.4)	0.7
Gas payables	9.5	4.8
Accrued liabilities	(44.3)	(31.1)
Other liabilities	(1.5)	(8.1)
Net cash provided by operating activities	135.8	129.3
Investing Activities:
Capital expenditures	(66.1)	(70.6)
Proceeds from sale of operating assets	0.1	1.0
Proceeds from insurance and other recoveries	0	1.4
Advances to affiliates	(1.3)	0
Investment in unconsolidated affiliates	(19.7)	0
Distribution from unconsolidated affiliate	9.0	0
Net cash used in investing activities	(78.0)	(68.2)
Financing Activities:
Proceeds from borrowings on revolving credit agreement	155.0	263.0
Repayment of borrowings on revolving credit agreement	(205.0)	(195.0)
Principal payment of capital lease obligation	(0.1)	0
Advances from affiliate	0	(0.4)
Distributions paid	(24.8)	(128.3)
Capital contributions from noncontrolling interests	7.8	0
Distributions paid to noncontrolling interests	(7.1)	0
Net cash used in financing activities	(74.2)	(60.7)
Increase in cash and cash equivalents	(16.4)	0.4
Cash and cash equivalents at beginning of period	28.5	3.9
Cash and cash equivalents at end of period	$ 12.1	$ 4.3