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Changes in Stockholders' Equity (Changes in Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance beginning of period $ 3,882.6 $ 3,443.8
Other comprehensive income, net of reclassification adjustments 46.7 136.7
Balance end of period 4,132.9 3,674.9
Defined Benefit Pension Plans    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance beginning of period (231.2)  
Other comprehensive income (loss) before reclassifications 0.0  
Net losses reclassified from accumulated other comprehensive loss 1.8  
Other comprehensive income, net of reclassification adjustments 1.8  
Balance end of period (229.4)  
Deferred Net (Losses) Gains on Derivatives    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance beginning of period (0.9)  
Other comprehensive income (loss) before reclassifications (1.0)  
Net losses reclassified from accumulated other comprehensive loss 1.5  
Other comprehensive income, net of reclassification adjustments 0.5  
Balance end of period (0.4)  
Cumulative Translation Adjustment    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance beginning of period (1,571.0)  
Other comprehensive income (loss) before reclassifications 44.4  
Net losses reclassified from accumulated other comprehensive loss 0.0  
Other comprehensive income, net of reclassification adjustments 44.4  
Balance end of period (1,526.6)  
Accumulated Other Comprehensive Loss    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance beginning of period (1,803.1) (1,770.9)
Other comprehensive income (loss) before reclassifications 43.4  
Net losses reclassified from accumulated other comprehensive loss 3.3  
Other comprehensive income, net of reclassification adjustments 46.7  
Balance end of period $ (1,756.4) $ (1,635.0)