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Consolidated Statement of Cash Flows - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Operating Activities [Abstract]    
Net Income $ 46.4 $ 40.1
Allowance for Funds Used During Construction – Equity (0.9) (0.9)
Income from Equity Investments – Net of Dividends (2.9) (0.8)
Depreciation Expense 46.8 38.4
Amortization of Power Purchase Agreements (5.6) (4.9)
Amortization of Other Intangible Assets and Other Assets 2.3 0.8
Deferred Income Tax Expense 9.2 6.1
Share-Based Compensation Expense 0.6 0.6
ESOP Compensation Expense 0.0 2.4
Defined Benefit Pension and Postretirement Benefit Expense 1.3 3.8
Bad Debt Expense 0.6 0.2
Changes in Operating Assets and Liabilities [Abstract]    
Accounts Receivable (4.2) 7.8
Inventories 1.1 (8.8)
Prepayments and Other 0.1 (0.7)
Accounts Payable (4.2) (14.0)
Other Current Liabilities 0.9 (1.7)
Changes in Regulatory and Other Non-Current Assets 2.8 (4.1)
Changes in Regulatory and Other Non-Current Liabilities (1.1) 7.5
Cash from Operating Activities 93.2 71.8
Investing Activities [Abstract]    
Proceeds from Sale of Available-for-sale Securities 1.1 0.2
Payments for Purchase of Available-for-sale Securities (0.3) (0.4)
Acquisitions of Subsidiaries – Net of Cash Acquired 0.0 (166.9)
Investment in ATC (1.2) (0.4)
Changes to Other Investments 0.2 0.0
Additions to Property, Plant and Equipment (42.4) (88.2)
Construction Costs for Development Project 0.0 (0.2)
Cash for Investing Activities (42.6) (255.9)
Financing Activities [Abstract]    
Proceeds from Issuance of Common Stock 9.0 141.5
Changes in Restricted Cash (5.8) (0.8)
Changes in Notes Payable (0.9) (3.4)
Repayments of Long-Term Debt (26.6) (2.0)
Acquisition-Related Contingent Consideration Payments (0.6) 0.0
Dividends on Common Stock (25.7) (24.9)
Cash from (for) Financing Activities (50.6) 110.4
Change in Cash and Cash Equivalents 0.0 (73.7)
Cash and Cash Equivalents at Beginning of Period 97.0 145.8
Cash and Cash Equivalents at End of Period $ 97.0 $ 72.1