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Fair Value (Fair Value Of Financial Assets And Liabilities Measured On A Recurring Basis) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Assets
Available-for-sale, securities	$ 150.4	$ 151.6
Total	201.9	236.4
Liabilities
Total	6.5	3.0
Fair Value, Inputs, Level 1
Assets
Risk management assets	0.0	0.0
Available-for-sale, securities	0.0	0.0
Total	0.0	0.0
Liabilities
Risk management liabilities	0.0	0.0
Total	0.0	0.0
Significant Other Observable Inputs (Level 2)
Assets
Risk management assets	51.5	84.8
Available-for-sale, securities	150.4	151.6
Total	201.9	236.4
Liabilities
Risk management liabilities	6.5	3.0
Total	6.5	3.0
Significant Unobservable Inputs (Level 3)
Assets
Risk management assets	0.0	0.0
Available-for-sale, securities	0.0	0.0
Total	0.0	0.0
Liabilities
Risk management liabilities	0.0	0.0
Total	0.0	0.0
Available-for-sale Securities
Assets
Available-for-sale, securities	150.4	151.6
Risk management assets
Assets
Risk management assets	51.5	84.8
Liabilities
Risk management liabilities	$ 6.5	$ 3.0

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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