v3.25.3
Fair Value Measurements - Assets and Liabilities at Fair Value (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Other current liabilities:    
Contingent consideration obligations $ 148.6 $ 291.2
Other non-current liabilities:    
Contingent consideration obligations 242.6 221.6
Fair Value 97.6  
Fair Value, Measurements Recurring    
Assets:    
Cash equivalents 3,398.8 1,664.9
Marketable equity securities 103.9 179.7
Derivative contracts 9.6 62.5
Convertible note 30.0  
Plan assets for deferred compensation 51.8 42.8
Total 3,691.7 1,949.9
Other current liabilities:    
Derivative contracts 89.1  
Contingent consideration obligations 148.6 291.2
Other non-current liabilities:    
Derivative contracts 10.2  
Contingent consideration obligations 242.6 221.6
Total 490.5 524.5
Derivative contracts   11.7
Total 490.5 524.5
Fair Value, Measurements Recurring | Corporate Debt Securities [Member]    
Other non-current liabilities:    
Fair Value 71.0  
Fair Value, Measurements Recurring | US Treasury and Government [Member]    
Other non-current liabilities:    
Fair Value 26.6  
Quoted Prices in Active Markets (Level 1) | Fair Value, Measurements Recurring    
Assets:    
Cash equivalents 0.0 0.0
Marketable equity securities 103.9 179.7
Derivative contracts 0.0 0.0
Convertible note 0.0  
Plan assets for deferred compensation 0.0 0.0
Total 103.9 179.7
Other current liabilities:    
Derivative contracts 0.0  
Contingent consideration obligations 0.0 0.0
Other non-current liabilities:    
Derivative contracts 0.0  
Contingent consideration obligations 0.0 0.0
Total 0.0 0.0
Derivative contracts   0.0
Total 0.0 0.0
Quoted Prices in Active Markets (Level 1) | Fair Value, Measurements Recurring | Corporate Debt Securities [Member]    
Other non-current liabilities:    
Fair Value 0.0  
Quoted Prices in Active Markets (Level 1) | Fair Value, Measurements Recurring | US Treasury and Government [Member]    
Other non-current liabilities:    
Fair Value 0.0  
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements Recurring    
Assets:    
Cash equivalents 3,398.8 1,664.9
Marketable equity securities 0.0 0.0
Derivative contracts 9.6 62.5
Convertible note 0.0  
Plan assets for deferred compensation 51.8 42.8
Total 3,557.8 1,770.2
Other current liabilities:    
Derivative contracts 89.1  
Contingent consideration obligations 0.0 0.0
Other non-current liabilities:    
Derivative contracts 10.2  
Contingent consideration obligations 0.0 0.0
Total 99.3 11.7
Derivative contracts   11.7
Total 99.3 11.7
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements Recurring | Corporate Debt Securities [Member]    
Other non-current liabilities:    
Fair Value 71.0  
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements Recurring | US Treasury and Government [Member]    
Other non-current liabilities:    
Fair Value 26.6  
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements Recurring    
Assets:    
Cash equivalents 0.0 0.0
Marketable equity securities 0.0 0.0
Derivative contracts 0.0 0.0
Convertible note 30.0  
Plan assets for deferred compensation 0.0 0.0
Total 30.0 0.0
Other current liabilities:    
Derivative contracts 0.0  
Contingent consideration obligations 148.6 291.2
Other non-current liabilities:    
Derivative contracts 0.0  
Contingent consideration obligations 242.6 221.6
Total 391.2 512.8
Derivative contracts   0.0
Total 391.2 $ 512.8
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements Recurring | Corporate Debt Securities [Member]    
Other non-current liabilities:    
Fair Value 0.0  
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements Recurring | US Treasury and Government [Member]    
Other non-current liabilities:    
Fair Value $ 0.0