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Consolidated Statement of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Operating Activities      
Net Income $ 137.8 $ 161.6 $ 185.5
AFUDC – Equity (2.6) (1.9) (2.3)
Income from Equity Investments – Net of Dividends 2.2 (3.2) (5.6)
Gain on Investments and Property, Plant and Equipment (0.8) (1.3) (1.6)
Depreciation Expense 231.6 217.7 200.6
Amortization of PSAs (11.4) (11.3) (11.6)
Amortization of Other Intangible Assets and Other Assets 9.9 10.4 11.7
Deferred Income Tax Benefit (26.9) (39.5) (6.7)
Share-Based and ESOP Compensation Expense 5.9 6.1 6.3
Defined Benefit Pension and Other Postretirement Benefit Expense 4.3 0.1 1.2
Bad Debt Expense 1.2 2.7 (0.1)
Provision (Payments) for Interim Rate Refund 0.0 0.0 (40.0)
Provision (Payments) for Tax Reform Refund 0.0 (0.2) (10.4)
Gain on Sale of U.S. Water Services 0.0 0.0 (23.6)
Changes in Operating Assets and Liabilities      
Accounts Receivable (13.0) (18.2) 22.6
Inventories (23.5) (1.4) (4.1)
Prepayments and Other (0.5) 0.9 0.3
Accounts Payable 15.0 11.8 (8.8)
Other Current Liabilities 28.0 11.7 (13.7)
Cash Contributions to Defined Benefit Pension Plans (10.3) (10.7) (10.4)
Changes in Fuel Adjustment Clause Regulatory Asset and Liability (56.4) 5.0 0.0
Changes in Regulatory and Other Non-Current Assets (12.0) (31.0) (25.2)
Changes in Regulatory and Other Non-Current Liabilities (15.0) (9.5) (17.2)
Cash from Operating Activities 263.5 299.8 246.9
Investing Activities      
Proceeds from Sale of Available-for-sale Securities 6.4 12.8 12.1
Payments for Purchase of Available-for-sale Securities (3.6) (8.7) (12.2)
Payments for Equity Investments (17.6) (99.1) (37.9)
Return of Capital from Equity Investments 0.0 0.0 8.3
Additions to Property, Plant and Equipment (473.3) (717.8) (597.1)
Proceeds from Sale of U.S. Water Services - Net of Transaction Costs and Cash Retained 0.0 0.0 268.6
Other Investing Activities 2.9 0.0 15.5
Cash for Investing Activities (485.2) (812.8) (342.7)
Financing Activities      
Proceeds from Issuance of Common Stock 69.9 18.1 1.9
Proceeds from Issuance of Long-Term Debt 733.0 672.4 201.9
Repayments of Short-Term and Long-Term Debt (552.9) (488.6) (72.2)
Proceeds from Non-Controlling Interest in Subsidiaries - Net of Issuance Costs 90.9 414.5 103.8
Acquisition-Related Contingent Consideration Payments 0.0 0.0 (3.8)
Dividends on Common Stock (131.9) (128.2) (121.4)
Other Financing Activities (4.8) (2.5) (0.9)
Cash (for) from Financing Activities 204.2 485.7 109.3
Change in Cash, Cash Equivalents and Restricted Cash (17.5) (27.3) 13.5
Cash, Cash Equivalents and Restricted Cash $ 47.7 $ 65.2 $ 92.5