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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
Mar. 31, 2025
Mar. 31, 2024
Earnings Per Share [Abstract]    
Net loss $ (13.2) $ (6.3)
Determination of shares:    
Weighted-average number of common shares outstanding 93.3 95.7
Shares issuable on exercise of stock awards, net of shares assumed to be purchased out of proceeds at average market price 0.0 0.0
Average common shares outstanding for fully diluted computation [1] 93.3 95.7
Per share:    
Basic loss per share $ (0.14) $ (0.07)
Diluted loss per share [1] $ (0.14) $ (0.07)
Shares outstanding as of March 31, 90.1 95.6
[1] Diluted by assumed exercise of stock-based compensation awards using the treasury stock method.