v3.26.1
Net Earnings (Loss) Per Share - Calculations of Net Earnings Per Share - Basic and Diluted (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]            
Net earnings (loss) available to common shareholders $ 53.5 $ 2.5 $ (67.1) $ 5.6 $ 56.0 $ (61.5)
Weighted-average common shares outstanding (in millions)            
Weighted-average common shares outstanding - basic 46.9   46.5   46.8 46.7
Weighted-average common shares outstanding - diluted 47.4   46.5   47.2 46.7
Net earnings (loss) per share - basic $ 1.14   $ (1.44)   $ 1.2 $ (1.32)
Net earnings (loss) per share - diluted $ 1.13   $ (1.44)   $ 1.19 $ (1.32)
Employee Stock Option            
Weighted-average common shares outstanding (in millions)            
Effect of dilutive securities - share-based awards 0.5   0.0   0.4 0.0