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FAIR VALUE MEASUREMENTS - Schedule of Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Assets    
Cash equivalents $ 2,283.7 $ 2,386.7
Available-for-sale investments: 1,350.0 1,300.5
Equity investments in unconsolidated entities 28.8 7.1
Investments held for deferred compensation plans 174.2 167.0
Derivatives 51.4 21.4
Total assets 3,888.1 3,882.7
Liabilities    
Derivatives 6.3 27.0
Contingent consideration liabilities 9.9 2.0
Other 6.1 6.1
Total liabilities 22.3 35.1
Corporate debt securities    
Assets    
Available-for-sale investments: 636.3 346.9
Asset-backed securities    
Assets    
Available-for-sale investments: 38.9 35.0
U.S. government and agency securities    
Assets    
Available-for-sale investments: 214.1 466.3
Commercial paper    
Assets    
Available-for-sale investments: 460.7 452.3
Level 1    
Assets    
Cash equivalents 1,229.8 1,366.7
Equity investments in unconsolidated entities 28.8 7.1
Investments held for deferred compensation plans 174.2 167.0
Derivatives 0.0 0.0
Total assets 1,432.8 1,540.8
Liabilities    
Derivatives 0.0 0.0
Contingent consideration liabilities 0.0 0.0
Other 0.0 0.0
Total liabilities 0.0 0.0
Level 1 | Corporate debt securities    
Assets    
Available-for-sale investments: 0.0 0.0
Level 1 | Asset-backed securities    
Assets    
Available-for-sale investments: 0.0 0.0
Level 1 | U.S. government and agency securities    
Assets    
Available-for-sale investments: 0.0 0.0
Level 1 | Commercial paper    
Assets    
Available-for-sale investments: 0.0 0.0
Level 2    
Assets    
Cash equivalents 1,053.9 1,020.0
Equity investments in unconsolidated entities 0.0 0.0
Investments held for deferred compensation plans 0.0 0.0
Derivatives 51.4 21.4
Total assets 2,455.3 2,341.9
Liabilities    
Derivatives 6.3 27.0
Contingent consideration liabilities 0.0 0.0
Other 0.0 0.0
Total liabilities 6.3 27.0
Level 2 | Corporate debt securities    
Assets    
Available-for-sale investments: 636.3 346.9
Level 2 | Asset-backed securities    
Assets    
Available-for-sale investments: 38.9 35.0
Level 2 | U.S. government and agency securities    
Assets    
Available-for-sale investments: 214.1 466.3
Level 2 | Commercial paper    
Assets    
Available-for-sale investments: 460.7 452.3
Level 3    
Assets    
Cash equivalents 0.0 0.0
Equity investments in unconsolidated entities 0.0 0.0
Investments held for deferred compensation plans 0.0 0.0
Derivatives 0.0 0.0
Total assets 0.0 0.0
Liabilities    
Derivatives 0.0 0.0
Contingent consideration liabilities 9.9 2.0
Other 6.1 6.1
Total liabilities 16.0 8.1
Level 3 | Corporate debt securities    
Assets    
Available-for-sale investments: 0.0 0.0
Level 3 | Asset-backed securities    
Assets    
Available-for-sale investments: 0.0 0.0
Level 3 | U.S. government and agency securities    
Assets    
Available-for-sale investments: 0.0 0.0
Level 3 | Commercial paper    
Assets    
Available-for-sale investments: $ 0.0 $ 0.0