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Consolidated Statement of Cash Flows - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Operating Activities [Abstract]    
Net Income $ 111.5 $ 122.7
Allowance for Funds Used During Construction – Equity (1.7) (2.6)
Income from Equity Investments – Net of Dividends (5.8) (3.7)
Gain on Sales of Investments and Property, Plant and Equipment (5.3) (0.2)
Depreciation Expense 141.8 120.7
Amortization of Power Purchase Agreements (16.7) (17.1)
Amortization of Other Intangible Assets and Other Assets 8.1 5.0
Deferred Income Tax Expense 15.5 26.5
Share-Based Compensation Expense 2.0 2.1
ESOP Compensation Expense 1.6 7.3
Defined Benefit Pension and Postretirement Benefit Expense 3.9 11.5
Bad Debt Expense 2.5 0.8
Changes in Operating Assets and Liabilities [Abstract]    
Accounts Receivable 10.6 11.6
Inventories 9.7 (24.1)
Prepayments and Other (0.7) (0.4)
Accounts Payable 0.6 0.0
Other Current Liabilities (23.0) (0.8)
Cash Contributions to Defined Benefit Pension Plans (6.3) 0.0
Changes in Regulatory and Other Non-Current Assets (18.3) (6.2)
Changes in Regulatory and Other Non-Current Liabilities 7.8 1.5
Cash from Operating Activities 237.8 254.6
Investing Activities [Abstract]    
Proceeds from Sale of Available-for-sale Securities 6.8 0.7
Payments for Purchase of Available-for-sale Securities (7.2) (1.1)
Acquisitions of Subsidiaries – Net of Cash Acquired 0.0 (324.8)
Investment in ATC (3.5) (1.2)
Changes to Other Investments 2.5 0.0
Additions to Property, Plant and Equipment (119.5) (208.2)
Proceeds from Sale of Property, Plant and Equipment 0.2 0.3
Cash for Investing Activities (120.7) (534.3)
Financing Activities [Abstract]    
Proceeds from Issuance of Common Stock 27.0 155.2
Proceeds from Issuance of Long-Term Debt 2.2 240.0
Changes in Restricted Cash 2.1 2.2
Changes in Notes Payable (1.6) (3.7)
Repayments of Long-Term Debt (50.7) (81.8)
Acquisition of Non-Controlling Interest (8.0) 0.0
Acquisition-Related Contingent Consideration Payments (0.8) 0.0
Debt Issuance Costs (0.1) (1.0)
Dividends on Common Stock (77.0) (74.0)
Cash from (for) Financing Activities (106.9) 236.9
Change in Cash and Cash Equivalents 10.2 (42.8)
Cash and Cash Equivalents at Beginning of Period 97.0 145.8
Cash and Cash Equivalents at End of Period $ 107.2 $ 103.0