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Fair Value (Narrative) (Details) - Level 1 - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed rate debt $ 130.0 $ 170.0
Carrying value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed rate debt $ 2,082.3 $ 1,587.6