CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Millions	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
OPERATING ACTIVITIES
Net income	$ 269.7	$ 263.3
Discontinued operations, net of income tax	0	(43.2)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	566.4	469.5
Deferred income taxes	155.9	206.3
Abandonment and impairment	16.4	29.1
Share-based compensation	16.5	11.3
Amortization of debt issuance costs and discounts	2.4	1.8
Dry exploratory well expense	0.5	0
Net gain from asset sales	(1.4)	(12.3)
Income from unconsolidated affiliates	(4.5)	(2.5)
Distributions from unconsolidated affiliates and other	7.6	2.1
Loss on early extinguishment of debt	0.7	13.3
Unrealized gain on basis-only swaps	(86.7)	(90.0)
Changes in operating assets and liabilities	12.2	(80.7)
Net Cash Provided by Operating Activities of Continuing Operations	955.7	768.0
INVESTING ACTIVITIES
Property acquisitions	(40.7)	(94.1)
Property, plant and equipment, including dry exploratory well expense	(957.7)	(941.8)
Proceeds from disposition of assets	7.4	25.4
Change in notes receivable	0	52.9
Net Cash Used in Investing Activities of Continuing Operations	(991.0)	(957.6)
FINANCING ACTIVITIES
Checks outstanding in excess of cash balances	7.2	0
Long-term debt issued	280.0	819.3
Long-term debt issuance costs paid	(10.5)	(18.1)
Current portion long-term debt repaid	(58.5)	(91.5)
Repayments of notes payable	0	(39.3)
Long-term debt repaid	(170.0)	(721.5)
Long-term debt extinguishment costs	0	(4.9)
Other capital contributions	1.6	1.4
Equity contribution	0	250.0
Dividends paid	(10.6)	(3.5)
Distribution from Questar	0.2	(15.7)
Distribution to noncontrolling interest	(4.1)	(3.7)
Net Cash Provided by Financing Activities of Continuing Operations	35.3	172.5
CASH USED IN CONTINUING OPERATIONS	0	(17.1)
Cash provided by operating activities of discontinued operations	0	68.6
Cash used in investing activities of discontinued operations	0	(39.9)
Cash used in financing activities of discontinued operations	0	(26.9)
Effect of change in cash and cash equivalents of discontinued operations	0	(1.8)
Change in cash and cash equivalents	0	(17.1)
Beginning cash and cash equivalents	0	19.3
Ending cash and cash equivalents	$ 0	$ 2.2