CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Assets
Cash and cash equivalents	$ 22.3	$ 27.4
Collateral on deposit	38.7	41.0
Accounts receivable and accrued unbilled revenues, net of reserves of $49.8 and $43.5, respectively	1,052.1	796.8
Inventories	254.8	271.9
Assets from risk management activities	240.1	145.4
Regulatory assets	129.4	110.8
Assets held for sale	0.7	10.1
Deferred income taxes	31.4	64.3
Prepaid taxes	146.9	152.8
Other current assets	55.8	38.6
Current assets	1,972.2	1,659.1
Property, plant, and equipment, net of accumulated depreciation of $3,325.8 and $3,114.7, respectively	6,410.5	5,501.9
Regulatory assets	1,412.6	1,813.8
Assets from risk management activities	75.4	45.3
Equity method investments	540.9	512.2
Goodwill	662.1	658.3
Other long-term assets	169.8	136.8
Total assets	11,243.5	10,327.4
Liabilities and Equity
Short-term debt	326.0	482.4
Current portion of long-term debt	100.0	313.5
Accounts payable	613.2	457.7
Liabilities from risk management activities	163.8	181.9
Accrued taxes	86.3	83.0
Regulatory liabilities	101.5	65.6
Liabilities held for sale	0	0.2
Other current liabilities	231.3	229.0
Current liabilities	1,622.1	1,813.3
Long-term debt	2,956.2	1,931.7
Deferred income taxes	1,390.3	1,203.8
Deferred investment tax credits	57.6	49.3
Regulatory liabilities	400.9	370.5
Environmental remediation liabilities	600.8	651.5
Pension and other postretirement benefit obligations	211.0	625.2
Liabilities from risk management activities	62.8	58.4
Asset retirement obligations	491.5	411.2
Other long-term liabilities	136.9	135.7
Long-term liabilities	6,308.0	5,437.3
Commitments and contingencies
Common stock – $1 par value; 200,000,000 shares authorized; 79,919,176 shares issued; 79,445,380 shares outstanding	79.9	78.3
Additional paid-in capital	2,660.5	2,574.6
Retained earnings	567.1	431.5
Accumulated other comprehensive loss	(23.2)	(40.9)
Shares in deferred compensation trust	(23.0)	(17.7)
Total common shareholders’ equity	3,261.3	3,025.8
Preferred stock of subsidiary – $100 par value; 1,000,000 shares authorized; 511,882 shares issued; 510,495 shares outstanding	51.1	51.1
Noncontrolling interest in subsidiaries	1.0	(0.1)
Total liabilities and equity	$ 11,243.5	$ 10,327.4