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Consolidated Statement of Cash Flows (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Operating Activities [Abstract]    
Net Income $ 46.5 $ 38.8
Allowance for Funds Used During Construction - Equity (2.1) (1.9)
Income from Equity Investments, Net of Dividends (2.3) (1.7)
Gain on Sale of Assets (0.1) 0
Gain on Sale of Investments (0.8) 0
Depreciation Expense 56.9 49.4
Amortization of Debt Issuance Costs 0.5 0.5
Deferred Income Tax Expense 11.6 13.1
Share-Based Compensation Expense 1.3 1.2
ESOP Compensation Expense 4.0 3.7
Defined Benefit Pension and Postretirement Benefit Expense 11.2 13.8
Bad Debt Expense 0.4 0.5
Changes in Operating Assets and Liabilities [Abstract]    
Accounts Receivable 9.9 12.4
Inventories (1.2) (0.2)
Prepayments and Other 7.4 1.6
Accounts Payable (10.1) (8.2)
Other Current Liabilities (5.8) 0
Cash Contributions to Defined Benefit Pension and Other Postretirement Benefit Plans (10.8) 0
Changes in Regulatory and Other Non-Current Assets (8.0) (1.8)
Changes in Regulatory and Other Non-Current Liabilities 2.6 6.9
Cash from Operating Activities 111.1 128.1
Investing Activities [Abstract]    
Proceeds from Sale of Available-for-sale Securities 8.1 1.0
Payments for Purchase of Available-for-sale Securities (1.4) (1.0)
Investment in ATC (1.6) (2.0)
Changes to Other Investments (2.6) (3.2)
Additions to Property, Plant and Equipment (128.6) (221.8)
Proceeds from Sale of Assets 0.9 0
Cash for Investing Activities (125.2) (227.0)
Financing Activities [Abstract]    
Proceeds from Issuance of Common Stock 33.3 30.5
Proceeds from Issuance of Long-Term Debt 150.0 15.6
Payments for Notes Payable 0 (1.1)
Payments for Long-Term Debt (65.5) (3.1)
Debt Issuance Costs (1.3) 0
Dividends on Common Stock (38.2) (35.5)
Cash from Financing Activities 78.3 6.4
Change in Cash and Cash Equivalents 64.2 (92.5)
Cash and Cash Equivalents at Beginning of Period 80.8 101.1
Cash and Cash Equivalents at End of Period $ 145.0 $ 8.6