v3.26.3
FAIR VALUE MEASUREMENTS - Schedule of Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Assets    
Cash equivalents $ 2,643.5 $ 2,386.7
Available-for-sale investments: 1,535.7 1,300.5
Equity investments in unconsolidated entities 48.0 7.1
Investments held for deferred compensation plans 175.2 167.0
Derivatives 50.1 21.4
Total assets 4,452.5 3,882.7
Liabilities    
Derivatives 8.5 27.0
Contingent consideration liabilities 9.9 2.0
Other   6.1
Total liabilities 18.4 35.1
Corporate debt securities    
Assets    
Available-for-sale investments: 724.4 346.9
Asset-backed securities    
Assets    
Available-for-sale investments: 32.8 35.0
U.S. government and agency securities    
Assets    
Available-for-sale investments: 260.2 466.3
Commercial paper    
Assets    
Available-for-sale investments: 518.3 452.3
Level 1    
Assets    
Cash equivalents 1,058.9 1,366.7
Equity investments in unconsolidated entities 48.0 7.1
Investments held for deferred compensation plans 175.2 167.0
Derivatives 0.0 0.0
Total assets 1,291.9 1,540.8
Liabilities    
Derivatives 0.0 0.0
Contingent consideration liabilities 0.0 0.0
Other   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: 9.8 0.0
Level 1 | Commercial paper    
Assets    
Available-for-sale investments: 0.0 0.0
Level 2    
Assets    
Cash equivalents 1,584.6 1,020.0
Equity investments in unconsolidated entities 0.0 0.0
Investments held for deferred compensation plans 0.0 0.0
Derivatives 50.1 21.4
Total assets 3,160.6 2,341.9
Liabilities    
Derivatives 8.5 27.0
Contingent consideration liabilities 0.0 0.0
Other   0.0
Total liabilities 8.5 27.0
Level 2 | Corporate debt securities    
Assets    
Available-for-sale investments: 724.4 346.9
Level 2 | Asset-backed securities    
Assets    
Available-for-sale investments: 32.8 35.0
Level 2 | U.S. government and agency securities    
Assets    
Available-for-sale investments: 250.4 466.3
Level 2 | Commercial paper    
Assets    
Available-for-sale investments: 518.3 452.3
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
Total liabilities 9.9 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