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Fair Value Measurements (Narrative) (Details) - Senior Notes [Member] - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt, long-term and short-term, combined carrying value $ 111.0 $ 114.1
Long-term debt, current 6.1 6.1
Long-term debt, fair value 74.6 68.6
Long-term debt, face amount $ 74.3 $ 74.3