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Risk Management Activities (Schedule of Cash Flow Hedges in AOCI) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Net current-period other comprehensive income (loss)	$ 41.4	$ 81.2
Interest Rate Risk
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Net current-period other comprehensive income (loss)	47.0
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	368 months

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- Definition

The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

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Maximum period the entity is hedging its exposure to the variability in future cash flows for forecasted transactions, excluding those forecasted transactions related to the payment of variable interest on existing financial instruments, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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