Debt and Other Financing (Schedule of Senior Secured Notes) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
6.50% Senior Secured Notes, due August 2022
Debt Instrument [Line Items]
Remaining Principal	$ 0.0	$ 400.0
Unamortized Discounts	0.0	(7.4)
Unamortized Debt Issuance Costs	0.0	0.0
Total	0.0	392.6
7.875% Senior Secured Notes, due August 2022 (2016 Notes)
Debt Instrument [Line Items]
Remaining Principal	0.0	500.0
Unamortized Discounts	0.0	(4.2)
Unamortized Debt Issuance Costs	0.0	0.0
Total	$ 0.0	$ 495.8

Debt Instrument, Remaining Principal Amount

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount, after accumulated amortization, of debt discount.

+ References

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-Publisher FASB
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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

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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