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Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value of debt, including amounts classified as current $ 308.9 $ 308.9 $ 308.0
Level 3      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Net unrealized losses related to level 3 financial instruments $ (0.1) $ (0.6)