CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Assets
Cash and cash equivalents	$ 56.6	$ 22.3
Collateral on deposit	74.4	37.4
Accounts receivable and accrued unbilled revenues, net of reserves of $61.9 and $49.4, respectively	1,543.8	1,037.0
Inventories	134.9	253.1
Assets from risk management activities	269.9	239.5
Regulatory assets	238.8	127.4
Assets held for sale	286.7	272.6
Deferred income taxes	0	31.4
Prepaid taxes	74.5	146.9
Other current assets	37.5	50.0
Current assets	2,717.1	2,217.6
Property, plant, and equipment, net of accumulated depreciation of $3,283.5 and $3,236.9, respectively	6,301.2	6,216.7
Regulatory assets	1,346.7	1,361.4
Assets from risk management activities	60.3	75.4
Equity method investments	548.1	540.9
Goodwill	662.1	662.1
Other long-term assets	166.7	169.4
Total assets	11,802.2	11,243.5
Liabilities and Equity
Short-term debt	321.9	326.0
Current portion of long-term debt	100.0	100.0
Accounts payable	864.9	604.8
Liabilities from risk management activities	175.8	163.8
Accrued taxes	111.4	80.9
Regulatory liabilities	149.9	101.1
Temporary LIFO liquidation credit	150.9	0
Liabilities held for sale	36.7	49.1
Deferred income taxes	12.8	0
Other current liabilities	218.6	228.8
Current liabilities	2,142.9	1,654.5
Long-term debt	2,956.2	2,956.2
Deferred income taxes	1,439.9	1,390.3
Deferred investment tax credits	57.6	57.6
Regulatory liabilities	438.8	383.7
Environmental remediation liabilities	588.4	600.0
Pension and other postretirement benefit obligations	95.6	200.8
Liabilities from risk management activities	46.2	62.8
Asset retirement obligations	497.0	491.0
Other long-term liabilities	133.6	133.2
Long-term liabilities	6,253.3	6,275.6
Commitments and contingencies
Common stock – $1 par value; 200,000,000 shares authorized; 79,963,091 shares issued; 79,534,371 shares outstanding	80.0	79.9
Additional paid-in capital	2,653.4	2,660.5
Retained earnings	665.0	567.1
Accumulated other comprehensive loss	(23.6)	(23.2)
Shares in deferred compensation trust	(20.8)	(23.0)
Total common shareholders’ equity	3,354.0	3,261.3
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	0.9	1.0
Total liabilities and equity	$ 11,802.2	$ 11,243.5