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Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value of senior notes and other long-term debt, including amounts classified as current $ 314.6 $ 314.6 $ 318.6
Level 3      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Net unrealized gains (losses) related to level 3 financial instruments $ (1.4) $ (1.1)