CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
OPERATING ACTIVITIES
Net income	$ 156.2	$ 167.3
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	413.3	377.4
Deferred income taxes	77.1	95.7
Abandonment and impairment	62.3	10.7
Share-based compensation	12.3	10.8
Amortization of debt issuance costs and discounts	2.4	1.5
Dry exploratory well expense	0.1	0.5
Net gain from asset sales	(1.5)	(0.2)
Income from unconsolidated affiliates	(3.3)	(2.2)
Distributions from unconsolidated affiliates and other	3.5	2.6
Non-cash loss on early extinguishment of debt	0.1	0
Unrealized gain on derivative contracts	(89.9)	(58.8)
Changes in operating assets and liabilities	61.7	23.3
Net Cash Provided by Operating Activities	694.3	628.6
INVESTING ACTIVITIES
Property acquisitions	(4.0)	(29.8)
Property, plant and equipment, including dry exploratory well expense	(681.5)	(632.0)
Proceeds from disposition of assets	3.6	1.6
Net Cash Used in Investing Activities	(681.9)	(660.2)
FINANCING ACTIVITIES
Checks outstanding in excess of cash balances	(29.4)	(1.5)
Long-term debt issued	800.0	0
Long-term debt issuance costs paid	(8.8)	0
Long-term debt repaid	(6.7)	(58.5)
Proceeds from credit facility	194.5	200.0
Repayments of credit facility	(801)	(100)
Other capital contributions	(6.4)	(0.4)
Dividends paid	(7.1)	(7.1)
Excess tax benefit on share-based compensation	2.0	1.4
Distribution from Questar	0	0.2
Distribution to noncontrolling interest	(3.1)	(2.5)
Net Cash Provided by Financing Activities	134.0	31.6
Change in cash and cash equivalents	146.4	0
Beginning cash and cash equivalents	0	0
Ending cash and cash equivalents	146.4	0
Supplemental Disclosures:
Cash paid for interest	42.7	64.6
Cash paid (received) for income taxes	8.0	(7.2)
Non-cash investing activities
Change in capital expenditure accrual balance	$ 45.3	$ 12.3