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Stockholders' Equity (Changes in Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance beginning of period $ 4,755.2 $ 4,132.9 $ 4,656.8 $ 3,882.6
Other comprehensive income (loss) (136.2) 71.6 (179.6) 118.3
Balance end of period 4,053.9 4,139.0 4,053.9 4,139.0
Defined Benefit Pension Plans        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance beginning of period     (238.6)  
Other comprehensive income (loss) before reclassifications     0.0  
Net losses reclassified from accumulated other comprehensive loss     3.6  
Other comprehensive income (loss)     3.6  
Balance end of period (235.0)   (235.0)  
Deferred Net (Losses) Gains on Derivatives        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance beginning of period 6.1   (0.8)  
Other comprehensive income (loss) before reclassifications (3.5)   1.1  
Net losses reclassified from accumulated other comprehensive loss 1.5   3.8  
Other comprehensive income (loss)     4.9  
Balance end of period 4.1   4.1  
Cumulative Translation Adjustment        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance beginning of period     (1,468.7)  
Other comprehensive income (loss) before reclassifications     (187.1)  
Net losses reclassified from accumulated other comprehensive loss     0.0  
Other comprehensive income (loss)     (187.1)  
Balance end of period (1,655.8)   (1,655.8)  
Accumulated Other Comprehensive Loss        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance beginning of period (1,751.5) (1,756.4) (1,708.1) (1,803.1)
Other comprehensive income (loss) before reclassifications     (186.0)  
Net losses reclassified from accumulated other comprehensive loss     7.4  
Other comprehensive income (loss)     (178.6)  
Balance end of period $ (1,886.7) $ (1,684.8) $ (1,886.7) $ (1,684.8)