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Consolidated Statement of Cash Flows (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Operating Activities [Abstract]    
Net Income $ 92.3 $ 71.7
Allowance for Funds Used During Construction - Equity (5.9) (3.4)
Income from Equity Investments, Net of Dividends (3.0) (3.1)
Gain on Sale of Assets / Investments (0.2) (2.4)
Depreciation Expense 99.5 86.3
Amortization of Debt Issuance Costs 0.8 0.8
Amortization of Power Purchase Agreements (9.0) 0
Deferred Income Tax Expense 25.2 20.4
Share-Based Compensation Expense 1.7 1.8
ESOP Compensation Expense 6.7 6.0
Defined Benefit Pension and Postretirement Benefit Expense 9.6 16.8
Bad Debt Expense 1.1 0.9
Changes in Operating Assets and Liabilities [Abstract]    
Accounts Receivable 16.9 8.2
Inventories (9.2) 5.1
Prepayments and Other 8.8 4.4
Accounts Payable (1.2) 3.9
Other Current Liabilities (12.8) (8.8)
Cash Contributions to Defined Benefit Pension and Other Postretirement Benefit Plans 0 (10.8)
Changes in Regulatory and Other Non-Current Assets (13.0) (13.5)
Changes in Regulatory and Other Non-Current Liabilities 3.8 4.6
Cash from Operating Activities 212.1 188.9
Investing Activities [Abstract]    
Proceeds from Sale of Available-for-sale Securities 3.3 15.0
Payments for Purchase of Available-for-sale Securities (4.3) (2.8)
Investment in ATC (3.1) (2.3)
Changes to Other Investments 31.1 (10.5)
Additions to Property, Plant and Equipment (467.8) (195.3)
Acquisition – Net of Cash Acquired (23.1) 0
Cash in Escrow for Acquisition 5.4 0
Proceeds from Sale of Assets 0 0.9
Cash for Investing Activities (458.5) (195.0)
Financing Activities [Abstract]    
Proceeds from Issuance of Common Stock 128.9 63.3
Proceeds from Issuance of Long-Term Debt 375.0 150.0
Changes in Restricted Cash (1.4) 0
Changes in Notes Payable 2.7 1.2
Reductions of Long-Term Debt (134.1) (66.2)
Debt Issuance Costs (3.1) (1.3)
Acquisition of Non-Controlling Interest (6.0) 0
Dividends on Common Stock (62.4) (57.2)
Cash from Financing Activities 299.6 89.8
Change in Cash and Cash Equivalents 53.2 83.7
Cash and Cash Equivalents at Beginning of Period 97.3 80.8
Cash and Cash Equivalents at End of Period $ 150.5 $ 164.5