Debt and Other Financing (Schedule of Public Notes) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
4.60% Notes, due March 2020
Debt Instrument [Line Items]
Remaining Principal	$ 0.0	$ 387.0
Unamortized Discounts	0.0	(0.1)
Unamortized Debt Issuance Costs	0.0	(0.5)
Total	0.0	386.4
5.00% Notes, due March 2023
Debt Instrument [Line Items]
Remaining Principal	461.9	461.9
Unamortized Discounts	(1.5)	(1.9)
Unamortized Debt Issuance Costs	(1.1)	(1.5)
Total	459.3	458.5
6.95% Notes, due March 2043
Debt Instrument [Line Items]
Remaining Principal	243.9	243.9
Unamortized Discounts	(0.5)	(0.6)
Unamortized Debt Issuance Costs	(2.1)	(2.2)
Total	$ 241.3	$ 241.1

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Carrying value as of the balance sheet date of notes payable (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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