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Earnings Per Share - Summary of Computation of Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ 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
Earnings Per Share [Abstract]                
Net income (loss) $ 4.0 $ 29.2 $ (13.2) $ 9.3 $ (125.2) $ (6.3) $ 20.0 $ (122.2)
Determination of shares:                
Weighted-average number of common shares outstanding 91.7     96.0     92.1 96.2
Shares issuable on exercise of stock awards, net of shares assumed to be purchased out of proceeds at average market price 1.6     1.5     1.8 0.0
Average common shares outstanding for fully diluted computation [1] 93.3     97.5     93.9 96.2
Per share:                
Basic income (loss) per share $ 0.04     $ 0.1     $ 0.22 $ (1.27)
Diluted income (loss) per share $ 0.04     $ 0.09     $ 0.21 $ (1.27)
Shares outstanding as of September 30, 90.1     93.4     90.1 93.4
[1] Diluted by assumed exercise of stock-based compensation awards using the treasury stock method.