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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Non-cash transactions:      
Capital expenditures included in current liabilities $ 170.4 $ 223.6 $ 152.0
Assets acquired under a finance lease   26.4 54.6
Assets acquired under an operating lease   13.4 0.0
Reclassification of other property to regulatory assets 0.0 0.0 245.3
Assets recorded for asset retirement obligations 91.5 54.6 78.1
Obligation to the Developer 69.7 0.0 0.0
Schedule of interest and income taxes paid:      
Cash paid for interest, net of interest capitalized amounts 349.0 349.7 354.2
Cash paid for income taxes, net of refunds(4) $ (1.0) $ 10.8 $ 3.3