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Fair Value (Fair Value Of Financial Assets And Liabilities Measured On A Recurring Basis) (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Assets
Total	$ 172.8	$ 158.6
Liabilities
Total	326.6	146.6
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	28.2	4.4
Available-for-sale securities	144.6	154.2
Total	172.8	158.6
Liabilities
Risk management liabilities	326.6	146.6
Total	326.6	146.6
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	144.6	154.2
Risk management assets
Assets
Risk management assets	28.2	4.4
Liabilities
Risk management liabilities	$ 326.6	$ 146.6

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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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