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Stockholders' Equity (Changes in Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance beginning of period $ 4,053.9 $ 4,139.0 $ 4,656.8 $ 3,882.6
Other comprehensive income (loss) 84.6 (52.1) (95.0) 66.2
Balance end of period 4,148.8 4,355.6 4,148.8 4,355.6
Defined Pension and Postretirement Benefit 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     5.6  
Other comprehensive income (loss)     5.6  
Balance end of period (233.0)   (233.0)  
Deferred Gains and Losses on Derivatives        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance beginning of period 4.1   (0.8)  
Other comprehensive income (loss) before reclassifications (0.3)   0.8  
Net losses reclassified from accumulated other comprehensive loss 1.9   5.7  
Other comprehensive income (loss)     6.5  
Balance end of period 5.7   5.7  
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     (107.2)  
Net losses reclassified from accumulated other comprehensive loss     0.0  
Other comprehensive income (loss)     (107.2)  
Balance end of period (1,575.9)   (1,575.9)  
Accumulated Other Comprehensive Loss        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance beginning of period (1,886.7) (1,684.8) (1,708.1) (1,803.1)
Other comprehensive income (loss) before reclassifications     (106.4)  
Net losses reclassified from accumulated other comprehensive loss     11.3  
Other comprehensive income (loss)     (95.1)  
Balance end of period $ (1,803.2) $ (1,736.9) $ (1,803.2) $ (1,736.9)