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Consolidated Statement of Cash Flows - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Operating Activities [Abstract]    
Net Income $ 46.5 $ 43.4
AFUDC – Equity (0.9) (0.5)
Income from Equity Investments – Net of Dividends 0.4 1.0
Loss (Gain) on Investments and Property, Plant and Equipment 0.1 (0.5)
Depreciation Expense 61.7 58.0
Amortization of PSAs (2.8) (2.8)
Amortization of Other Intangible Assets and Other Assets 2.1 2.5
Deferred Income Tax Benefit (4.0) (10.4)
Share-Based and ESOP Compensation Expense 1.3 1.7
Defined Benefit Pension and Postretirement Benefit Expense (Benefit) (0.4) 1.1
Bad Debt Expense 0.4 0.4
Changes in Operating Assets and Liabilities [Abstract]    
Accounts Receivable 4.9 (2.2)
Inventories (98.9) 0.2
Prepayments and Other (7.4) (1.3)
Accounts Payable (10.6) (8.6)
Other Current Liabilities (1.0) 23.5
Cash Contributions to Defined Benefit Pension Plans 0.0 (10.3)
Changes in Regulatory and Other Non-Current Assets 2.0 (0.6)
Changes in Regulatory and Other Non-Current Liabilities 1.8 (6.1)
Cash (used in) provided by Operating Activities (4.8) 88.5
Investing Activities [Abstract]    
Proceeds from Sale of Available-for-sale Securities 0.5 1.2
Payments for Purchase of Available-for-sale Securities (0.4) (0.6)
Payments for Equity Method Investments (2.7) (1.0)
Additions to Property, Plant and Equipment (57.3) (134.4)
Other Investing Activities (0.2) 3.9
Cash used in Investing Activities (60.1) (130.9)
Financing Activities [Abstract]    
Proceeds from Issuance of Common Stock 3.3 5.0
Proceeds from Issuance of Short-Term and Long-Term Debt 228.9 194.9
Repayments of Short-Term and Long-Term Debt (259.2) (41.4)
Proceeds from Non-controlling Interest in Subsidiaries - Net 154.1 28.9
Dividends on Common Stock (34.5) (32.8)
Other Financing Activities (0.4) (0.4)
Cash provided by Financing Activities 92.2 154.2
Change in Cash, Cash Equivalents and Restricted Cash 27.3 111.8
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 75.0 $ 177.0