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Earnings Per Share - Reconciliation of Weighted-Average Shares (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]        
Net Income (Loss) Attributable to Parent $ 64.6 $ 12.9 $ 239.7 $ 30.2
Basic (in shares) 72.4 73.7 72.4 74.6
Effect of stock equivalents (in shares) 0.8 1.1 1.1 1.1
Diluted (in shares) 73.2 74.8 73.5 75.7