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Consolidated Statement of Cash Flows - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Operating Activities [Abstract]    
Net Income $ 43.4 $ 64.5
AFUDC – Equity (0.5) (0.5)
Income from Equity Investments – Net of Dividends 1.0 0.0
Realized and Unrealized (Gain) Loss on Investments and Property, Plant and Equipment (0.5) 3.1
Depreciation Expense 58.0 53.4
Amortization of PSAs (2.8) (2.8)
Amortization of Other Intangible Assets and Other Assets 2.5 2.3
Deferred Income Tax Benefit (10.4) (13.8)
Share-Based and ESOP Compensation Expense 1.7 1.7
Defined Benefit Pension and Postretirement Benefit Expense 1.1 0.0
Bad Debt Expense 0.4 0.4
Changes in Operating Assets and Liabilities [Abstract]    
Accounts Receivable (2.2) (3.4)
Inventories 0.2 (6.2)
Prepayments and Other (1.3) 4.0
Accounts Payable (8.6) (5.5)
Other Current Liabilities 23.5 7.1
Cash Contributions to Defined Benefit Pension Plans (10.3) (10.7)
Changes in Regulatory and Other Non-Current Assets (0.6) (11.4)
Changes in Regulatory and Other Non-Current Liabilities (6.1) 6.0
Cash from Operating Activities 88.5 88.2
Investing Activities [Abstract]    
Proceeds from Sale of Available-for-sale Securities 1.2 0.9
Payments for Purchase of Available-for-sale Securities (0.6) (1.1)
Payments for Equity Investments (1.0) (27.8)
Additions to Property, Plant and Equipment (134.4) (154.3)
Other Investing Activities 3.9 0.4
Cash for Investing Activities (130.9) (181.9)
Financing Activities [Abstract]    
Proceeds from Issuance of Common Stock 5.0 3.3
Proceeds from Issuance of Short-Term and Long-Term Debt 194.9 110.0
Repayments of Long-Term Debt (41.4) (1.4)
Proceeds from Non-controlling Interests 28.9 0.0
Dividends on Common Stock (32.8) (31.9)
Other Financing Activities (0.4) 0.1
Cash from Financing Activities 154.2 80.1
Change in Cash, Cash Equivalents and Restricted Cash 111.8 (13.6)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 177.0 $ 78.9