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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($)
$ in Millions
Total
Common Stock
Additional Paid-in Capital
Treasury Stock
Retained Earnings
Accumulated Other Comprehensive Loss
Noncontrolling Interests
Balance at Dec. 31, 2020 $ 1,446.0 $ 1.3 $ 1,228.4 $ (703.0) $ 1,013.2 $ (94.2) $ 0.3
Balance, shares at Dec. 31, 2020   52,734,049          
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) 70.5       70.7   (0.2)
Other comprehensive (loss) income (78.5)         (78.4) (0.1)
Stock issued under employee stock plans 8.7   9.1 (0.4)      
Stock issued under employee stock plans, shares   413,835          
Share-based compensation 36.6   36.6        
Repurchase of shares (227.8)     (227.8)      
Repurchase of shares, shares   (2,000,000)          
Balance at Dec. 31, 2021 1,255.5 $ 1.3 1,274.1 (931.2) 1,083.9 (172.6) (0.0)
Balance, shares at Dec. 31, 2021   51,147,884          
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) 230.7       231.0   (0.3)
Other comprehensive (loss) income (78.3)         (78.4) 0.1
Adoption of ASU-2020-60 on Convertible bond | ASU 2020-06 (40.7)   (74.1)   33.4    
Stock issued under employee stock plans 8.1 7.7 0.4      
Stock issued under employee stock plans, shares   314,358          
Share-based compensation 44.1   44.1        
Repurchase of shares (175.0)     (175.0)      
Repurchase of shares, shares   (1,639,535)          
Balance at Dec. 31, 2022 1,244.4 $ 1.3 1,251.8 (1,105.8) 1,348.3 (251.0) (0.2)
Balance, shares at Dec. 31, 2022   49,822,707          
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) 279.5       279.7   (0.2)
Other comprehensive (loss) income 47.9       (0.1) 47.8 0.2
Stock issued under employee stock plans (2.6) 6.1 3.5      
Stock issued under employee stock plans, shares   292,151          
Share-based compensation 53.7   53.7        
Repurchase of shares (378.4)     (378.4)
Repurchase of shares, shares   (4,336,896)          
Balance at Dec. 31, 2023 $ 1,249.7 $ 1.3 $ 1,311.6 $ (1,487.7) $ 1,627.9 $ (203.2) $ (0.2)
Balance, shares at Dec. 31, 2023   45,777,962