v3.26.1
Fair Value (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Carrying Amount      
Assets:      
Cash and cash equivalents $ 3,336.2   $ 6,881.1
Marketable equity securities 0.8   0.9
Non-marketable equity securities 0.0   62.1
Cross currency swaps - net investment hedge 11.9   7.1
Liabilities:      
Short-term debt 48.8   62.0
Foreign currency derivatives 0.2   0.0
Contingent purchase price obligations 244.8   214.9
Long-Term Debt 9,953.2   9,054.5
Fair Value      
Assets:      
Cash and cash equivalents 3,336.2   6,881.1
Marketable equity securities 0.8   0.9
Non-marketable equity securities 0.0   62.1
Cross currency swaps - net investment hedge 11.9   7.1
Liabilities:      
Short-term debt 48.8   62.0
Foreign currency derivatives 0.2   0.0
Contingent purchase price obligations 244.8   214.9
Long-Term Debt 9,624.7   8,818.9
Contingent purchase price obligations      
Changes in Contingent Purchase Price Obligations [Roll Forward]      
January 1 214.9 $ 220.1  
Acquisitions 24.8 5.4  
Revaluation and interest 8.2 7.3  
Payments (3.3) (41.5)  
Foreign currency translation 0.2 0.8  
June 30 244.8 $ 192.1  
Fair Value, Recurring [Member]      
Assets:      
Cash and cash equivalents 3,336.2   6,881.1
Marketable equity securities 0.8   0.9
Cross currency swaps - net investment hedge 11.9   7.1
Liabilities:      
Contingent purchase price obligations 244.8   214.9
Fair Value, Recurring [Member] | Level 1      
Assets:      
Cash and cash equivalents 3,336.2   6,881.1
Marketable equity securities 0.8   0.9
Fair Value, Recurring [Member] | Level 2      
Assets:      
Cross currency swaps - net investment hedge 11.9   7.1
Fair Value, Recurring [Member] | Level 3      
Liabilities:      
Contingent purchase price obligations $ 244.8   $ 214.9