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Fair Value (Fair Value Of Financial Assets And Liabilities Measured On A Recurring Basis) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Assets
Available-for-sale, securities	$ 168.9	$ 170.9
Total	215.6	184.1
Liabilities
Total	122.7	222.8
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	46.7	13.2
Available-for-sale, securities	168.9	170.9
Total	215.6	184.1
Liabilities
Risk management liabilities	122.7	222.8
Total	122.7	222.8
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	168.9	170.9
Risk management assets
Assets
Risk management assets	46.7	13.2
Liabilities
Risk management liabilities	$ 122.7	$ 222.8

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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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