v3.26.1
Equity (Components of Shareholders' Equity Rollforward) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance $ 2,101.2 $ 2,067.6 $ 1,606.9 $ 1,500.7 $ 2,067.6 $ 1,500.7
Net earnings 184.6 138.1 159.7 148.2 322.7 307.9
Other comprehensive income (loss), net of tax (6.7) (21.9) 90.7 36.6    
Repurchase of ordinary shares (120.0) (40.6) (40.0) (40.0) (160.6) (80.0)
Share-based compensation activity 6.3 5.4 13.0 5.4    
Dividends to ordinary shareholders ($0.55 per share) (46.8) (47.4) (43.8) (44.0)    
Ending balance $ 2,118.6 $ 2,101.2 $ 1,786.5 $ 1,606.9 2,118.6 1,786.5
Dividends per share (in dollars per share) $ 0.55 $ 0.55 $ 0.51 $ 0.51    
Ordinary shares            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance $ 0.9 $ 0.9 $ 0.9 $ 0.9 $ 0.9 $ 0.9
Beginning balance (in shares) 85.9 86.1 86.1 86.3 86.1 86.3
Repurchase of ordinary shares (in shares) (0.9) (0.3) (0.3) (0.3)    
Share-based compensation activity, shares (in shares) 0.1 0.1 0.0 0.1    
Ending balance $ 0.9 $ 0.9 $ 0.9 $ 0.9 $ 0.9 $ 0.9
Ending balance (in shares) 85.1 85.9 85.8 86.1 85.1 85.8
Capital in excess of par value            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance $ 0.0 $ 34.2 $ 0.0 $ 0.0 $ 34.2 $ 0.0
Repurchase of ordinary shares (6.3) (39.6) (13.0) (5.4)    
Share-based compensation activity 6.3 5.4 13.0 5.4    
Ending balance 0.0 0.0 0.0 0.0 0.0 0.0
Retained earnings            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance 2,327.8 2,238.1 1,901.0 1,831.4 2,238.1 1,831.4
Net earnings 184.6 138.1 159.7 148.2    
Repurchase of ordinary shares (113.7) (1.0) (27.0) (34.6)    
Dividends to ordinary shareholders ($0.55 per share) (46.8) (47.4) (43.8) (44.0)    
Ending balance 2,351.9 2,327.8 1,989.9 1,901.0 2,351.9 1,989.9
Accumulated other comprehensive loss            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance (227.5) (205.6) (295.0) (331.6) (205.6) (331.6)
Other comprehensive income (loss), net of tax (6.7) (21.9) 90.7 36.6    
Ending balance $ (234.2) $ (227.5) $ (204.3) $ (295.0) $ (234.2) $ (204.3)