Condensed Consolidated Statements of Income (Unaudited) (USD $) In Millions, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Operating revenues
Gas distribution (includes revenue taxes of $31.4, $23.9, $106.3 and $97.8, respectively)	$ 358.9	$ 299.5	$ 1,274.7	$ 1,368.3
Shipping	79.9	86.0	160.7	169.5
Other energy ventures	48.5	50.3	111.5	116.0
Corporate and eliminations	(10.3)	(10.2)	(32.9)	(35.3)
Total operating revenues	477.0	425.6	1,514.0	1,618.5
Operating expenses
Gas distribution - Cost of gas	181.8	118.9	821.8	906.8
Gas distribution - Operating and maintenance	66.4	79.1	150.0	142.9
Gas distribution - Depreciation	47.1	45.9	94.2	91.9
Gas distribution - Taxes, other than income taxes	35.7	28.2	114.9	106.1
Shipping	80.2	81.8	162.2	165.8
Other energy ventures	39.1	38.9	97.6	100.2
Other corporate expenses and eliminations	(8.5)	(10.6)	(27.7)	(34.6)
Total operating expenses	441.8	382.2	1,413.0	1,479.1
Operating income	35.2	43.4	101.0	139.4
Interest expense, net of amounts capitalized	8.7	9.7	15.6	18.7
Equity investment income, net	3.3	2.1	7.7	3.6
Other income, net	0.4	1.0	0.8	1.4
Income before income taxes	30.2	36.8	93.9	125.7
Income tax expense, net of benefits	11.0	12.6	29.5	41.0
Net income	$ 19.2	$ 24.2	$ 64.4	$ 84.7
Average shares of common stock outstanding
Basic	45.9	45.6	45.9	45.5
Diluted	45.9	45.8	45.9	45.7
Earnings per average share of common stock
Basic	$ 0.42	$ 0.53	$ 1.40	$ 1.86
Diluted	$ 0.42	$ 0.53	$ 1.40	$ 1.85
Dividends declared per share of common stock	$ 0.465	$ 0.465	$ 0.930	$ 0.930