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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Apr. 19, 2021
Non-cash transactions:        
Capital expenditures included in current liabilities $ 315.0 $ 275.1 $ 245.7  
Assets acquired under a finance lease   19.3 22.4  
Assets acquired under an operating lease   8.8 6.0  
Reclassification of other property to regulatory assets 0.0 0.0 607.6  
Assets recorded for asset retirement obligations 61.1 6.3 12.0  
Obligation to the Developer 0.0 0.0 277.5  
Purchase Contract Liability 0.0 65.0 129.4 $ 168.8
Schedule of interest and income taxes paid:        
Cash paid for interest on debt, net of interest capitalized amounts 433.9 343.8 322.4  
Cash paid for interest on finance leases 8.6 8.5 9.4  
Cash paid for income taxes, net of refunds $ 9.4 $ 7.2 $ 5.4