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Debt and Other Financing (Schedule of Public Notes) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
5.00% Notes, due March 2023    
Debt Instrument [Line Items]    
Remaining Principal $ 461.9 $ 461.9
Unamortized Discounts (1.0) (1.5)
Unamortized Debt Issuance Costs (0.8) (1.1)
Total 460.1 459.3
6.95% Notes, due March 2043    
Debt Instrument [Line Items]    
Remaining Principal 216.1 243.9
Unamortized Discounts (0.5) (0.5)
Unamortized Debt Issuance Costs (1.8) (2.1)
Total $ 213.8 $ 241.3