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Net Income (Loss) Per Share (Schedule of Income Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Aug. 18, 2025
Nov. 07, 2024
Debt Instrument [Line Items]                    
Net income (loss) $ 3.9 $ 28.9 $ 27.2 $ (5.0) $ 30.6 $ (6.1) $ 60.0 $ 19.5    
Average number of shares outstanding, basic 18,317     16,422     17,672 16,172    
Potentially dilutive shares related to stock options 51     0     63 64    
Average number of shares outstanding, diluted 20,677     16,422     18,965 16,236    
Net income (loss) per common share - basic $ 0.21     $ (0.30)     $ 3.40 $ 1.21    
Net income (loss) per common share - diluted $ 0.19     $ (0.30)     $ 3.16 $ 1.20    
Antidilutive securities excluded from computation of earnings per share 0     34     0 3    
Convertible Debt                    
Debt Instrument [Line Items]                    
Antidilutive securities excluded from computation of earnings per share 133     0     2,290 0    
2.25 Percent Convertible Note                    
Debt Instrument [Line Items]                    
Long-term debt, face amount                   $ 402.5
Potentially dilutive shares related to stock options 2,309     0     1,230 0    
0.0 Percent Convertible Note                    
Debt Instrument [Line Items]                    
Long-term debt, face amount                 $ 805.0