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Earnings per Share - Schedule of Earnings (Loss) per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Subsidiary, Sale of Stock [Line Items]        
Net income (loss) - basic $ 83.1 $ 68.5 $ 102.0 $ 65.5
Net income (loss) - diluted $ 83.1 $ 68.5 $ 102.0 $ 65.5
Weighted-average shares outstanding:        
Basic (in shares) 97.9 95.8 97.5 95.6
Effect of dilutive securities:        
Diluted (in shares) 101.1 99.0 100.6 98.3
Earnings per share, basic (in USD per share) $ 0.85 $ 0.72 $ 1.05 $ 0.69
Earnings per share, diluted (in USD per share) $ 0.82 $ 0.69 $ 1.01 $ 0.67
Shares excluded from diluted per share amounts because their effect would have been anti-dilutive (in shares) 4.4 4.9 5.2 5.5
2024 Notes        
Effect of dilutive securities:        
2024 Notes (in shares) 0.6 0.6 0.6 0.5
Stock options        
Effect of dilutive securities:        
Effect of dilutive securities (in shares) 1.8 1.9 1.7 1.7
Restricted stock        
Effect of dilutive securities:        
Effect of dilutive securities (in shares) 0.7 0.8 0.7 0.5