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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Tax Credit Carryforward [Line Items]        
Effective tax rate 20.80% 17.90% 24.40% 21.80%
Benefits from tax settlements     $ 20.6  
Investment tax credits     7.9 $ 60.2
Additional federal and state benefits     6.8 6.8
Cash paid (refunded) for income taxes     137.9 $ 90.5
Liability for penalties $ 0.3   0.3  
Liability for interest related to uncertain tax positions 12.4   12.4  
State Loss Carryforwards        
Tax Credit Carryforward [Line Items]        
Deferred tax assets, valuation allowance $ 44.1   $ 44.1