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Income Tax Expense - Reconciliation of Taxes from Federal Statutory Rate to Total Income Tax Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of Taxes from Federal Statutory Rate to Total Income Tax Expense [Abstract]      
Income Before Non-Controlling Interest and Income Taxes $ 110.9 $ 122.1 $ 178.9
Statutory Federal Income Tax Rate 21.00% 21.00% 21.00%
Income Taxes Computed at Statutory Federal Rate $ 23.3 $ 25.6 $ 37.6
Increase (Decrease) in Tax Due to: [Abstract]      
State Income Taxes – Net of Federal Income Tax Benefit 8.6 7.7 17.2
Production Tax Credits (53.5) (62.7) (50.7)
Regulatory Differences – Excess Deferred Tax Benefit [1] (9.5) (9.9) (8.8)
U.S. Water Services Sale of Stock Basis Difference 0.0 0.0 1.7
Non-controlling interest 6.3 2.7 0.0
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Amount 0.5 0.0 0.0
Other (2.6) (2.9) (3.6)
Total Income Tax Expense (Benefit) $ (26.9) $ (39.5) $ (6.6)
Effective Tax Rate (24.30%) (32.40%) (3.70%)
[1] Excess deferred income taxes are being returned to customers under both the Average Rate Assumption Method and amortization periods as approved by regulators. (See Note 4. Regulatory Matters.)