CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Current Assets
Cash & cash equivalents	$ 16.6	$ 68.6
Accounts receivable - less reserves of $5.1 & $6.0, respectively	262.9	225.3
Accrued unbilled revenues	207.1	172.4
Inventories	126.6	129.9
Recoverable fuel & natural gas costs	19.2	29.9
Prepayments & other current assets	47.0	52.7
Total current assets	679.4	678.8
Utility Plant
Original cost	7,015.4	6,545.4
Less: accumulated depreciation & amortization	2,738.7	2,562.5
Net utility plant	4,276.7	3,982.9
Investments in unconsolidated affiliates	19.7	20.4
Other utility & corporate investments	43.7	34.1
Other nonutility investments	9.6	16.1
Nonutility plant - net	464.1	423.9
Goodwill	293.5	293.5
Regulatory assets	416.8	308.8
Other assets	35.8	42.2
TOTAL ASSETS	6,239.3	5,800.7
Current Liabilities
Accounts payable	366.2	302.2
Accrued liabilities	222.3	207.7
Short-term borrowings	249.5	194.4
Current maturities of long-term debt	100.0	124.1
Total current liabilities	938.0	828.4
Long-term Debt - Net of Current Maturities	1,738.7	1,589.9
Deferred Credits & Other Liabilities
Deferred income taxes	491.3	905.7
Regulatory liabilities	937.2	453.7
Deferred credits & other liabilities	284.8	254.9
Total deferred credits & other liabilities	1,713.3	1,614.3
Commitments & Contingencies
Common Shareholders' Equity
Common stock (no par value) - issued & outstanding 83.0 & 82.9 shares, respectively	736.9	729.8
Retained earnings	1,113.7	1,039.6
Accumulated other comprehensive (loss)	(1.3)	(1.3)
Total common shareholders' equity	1,849.3	1,768.1
TOTAL LIABILITIES & SHAREHOLDERS' EQUITY	$ 6,239.3	$ 5,800.7

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.