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Risk Management Activities (Schedule of Cash Flow Hedges in AOCI) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Net current-period other comprehensive income (loss) $ 89.7 $ 29.9 $ (64.1)
Interest rate risk programs      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Net current-period other comprehensive income (loss) 109.9    
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net $ (0.3)    
Maximum Length of Time Hedged in Interest Rate Cash Flow Hedge 353 months