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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Apr. 19, 2021
Non-cash transactions:        
Capital expenditures included in current liabilities $ 275.1 $ 245.7 $ 170.4  
Assets acquired under a finance lease   22.4 59.3  
Assets acquired under an operating lease   6.0 10.9  
Reclassification of other property to regulatory assets 0.0 607.6 0.0  
Assets recorded for asset retirement obligations 6.3 12.0 91.5  
Obligation to the Developer 0.0 277.5 69.7  
Purchase Contract Liability 65.0 129.4 0.0 $ 168.8
Schedule of interest and income taxes paid:        
Cash paid for interest on long-term debt, net of interest capitalized amounts 343.8 322.4 349.0  
Cash paid for interest on finance leases 8.5 9.4 11.1  
Cash paid for income taxes, net of refunds(5) $ 7.2 $ 5.4 $ (1.0)