CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Operating Activities
Net income	$ 161.1	$ 183.6
Adjustments to reconcile net income to net cash provided by operating activities
Discontinued operations, net of tax	0.2	(5.3)
Goodwill impairment loss	(6.7)	0
Depreciation and amortization expense	144.2	126.4
Recoveries and refunds of regulatory assets and liabilities	59.1	28.8
Net unrealized (gains) losses on energy contracts	(24.8)	0.3
Bad debt expense	30.8	14.4
Pension and other postretirement expense	11.9	31.8
Pension and other postretirement contributions	(69.5)	(64.2)
Deferred income taxes and investment tax credits	83.1	144.0
Equity income, net of dividends	(9.5)	(9.6)
Termination of tolling agreement with Fox Energy Company LLC	0	(50.0)
Other	12.8	13.3
Changes in working capital
Collateral on deposit	(1.5)	(19.6)
Accounts receivable and accrued unbilled revenues	89.0	19.8
Inventories	29.7	69.8
Other current assets	41.0	(54.0)
Accounts payable	(16.2)	41.3
Temporary LIFO liquidation credit	57.9	33.4
Other current liabilities	(20.0)	(56.2)
Net cash provided by operating activities	586.0	448.0
Investing Activities
Capital expenditures	(348.6)	(300.1)
Capital contributions to equity method investments	(10.2)	(6.8)
Rabbi trust funding related to potential change in control	(65.0)	0
Acquisition of Fox Energy Company LLC	0	(391.6)
Acquisitions at IES	0	12.4
Grant received related to Crane Creek wind project	0	69.0
Other	(6.0)	(2.5)
Net cash used for investing activities	(429.8)	(644.4)
Financing Activities
Short-term debt, net	94.7	150.8
Borrowing on term credit facility	0	200.0
Issuance of long-term debt	0	104.0
Repayment of long-term debt	(100.0)	(187.0)
Proceeds from stock option exercises	11.9	31.2
Shares purchased for stock-based compensation	(28.7)	(2.0)
Payment of dividends
Preferred stock of subsidiary	(1.6)	(1.6)
Common stock	(108.2)	(100.7)
Other	(8.2)	(7.4)
Net cash (used for) provided by financing activities	(140.1)	187.3
Change in cash and cash equivalents - continuing operations	16.1	(9.1)
Change in cash and cash equivalents - discontinued operations
Net cash provided by operating activities	6.6	0.3
Net cash provided by investing activities	0	1.6
Net change in cash and cash equivalents	22.7	(7.2)
Cash and cash equivalents at beginning of period	22.3	27.4
Cash and cash equivalents at end of period	45.0	20.2
Supplemental Cash Flow Information
Cash paid for interest	74.5	57.1
Cash received for income taxes	$ (59.2)	$ (1.3)