Condensed Consolidated Statements of Income (Unaudited) (USD $) In Millions, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Operating revenues
Gas distribution (includes revenue taxes of $14.4, $14.0, $120.7 and $111.8, respectively)	$ 239.9	$ 233.5	$ 1,514.6	$ 1,601.8
Shipping	78.4	83.9	239.1	253.4
Other energy ventures	35.8	41.2	147.3	157.2
Corporate and eliminations	(5.7)	(6.1)	(38.6)	(41.4)
Total operating revenues	348.4	352.5	1,862.4	1,971.0
Operating expenses
Gas distribution - Cost of gas	92.9	75.5	914.7	982.3
Gas distribution - Operating and maintenance	60.0	74.2	210.0	217.1
Gas distribution - Depreciation	47.1	45.9	141.3	137.8
Gas distribution - Taxes, other than income taxes	18.6	18.3	133.5	124.4
Gas distribution - Other	0	(1.3)	0	(1.3)
Shipping	82.1	80.3	244.3	246.1
Other energy ventures	34.1	34.1	131.7	134.3
Other corporate expenses and eliminations	(4.7)	(4.9)	(32.4)	(39.5)
Total operating expenses	330.1	322.1	1,743.1	1,801.2
Operating income	18.3	30.4	119.3	169.8
Interest expense, net of amounts capitalized	8.5	9.7	24.1	28.4
Equity investment income, net	4.3	1.5	12.0	5.1
Other income, net	0.5	0.5	1.3	1.9
Income before income taxes	14.6	22.7	108.5	148.4
Income tax expense, net of benefits	8.9	9.1	38.4	50.1
Net income	$ 5.7	$ 13.6	$ 70.1	$ 98.3
Average shares of common stock outstanding
Basic	45.9	45.7	45.9	45.6
Diluted	46.0	45.9	45.9	45.8
Earnings per average share of common stock
Basic	$ 0.12	$ 0.30	$ 1.52	$ 2.16
Diluted	$ 0.12	$ 0.30	$ 1.52	$ 2.15
Dividends declared per share of common stock	$ 0.465	$ 0.465	$ 1.395	$ 1.395