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Debt and Other Financing (Schedule of Public Notes) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
5.00% Notes, due March 2023    
Debt Instrument [Line Items]    
Remaining Principal $ 461.9 $ 461.9
Unamortized Discounts (0.5) (1.0)
Unamortized Debt Issuance Costs (0.6) (0.8)
Total 460.8 460.1
6.95% Notes, due March 2043    
Debt Instrument [Line Items]    
Remaining Principal 216.1 216.1
Unamortized Discounts (1.7) (0.5)
Unamortized Debt Issuance Costs (0.5) (1.8)
Total $ 213.9 $ 213.8