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INVESTMENTS - Schedule of Investments in Debt Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Held-to-maturity    
Fair Value $ 39.0  
Available-for-sale    
Amortized Cost 1,351.5 $ 1,301.6
Gross Unrealized Gains 0.0 0.3
Gross Unrealized Losses (1.5) (1.4)
Fair Value 1,350.0 1,300.5
Bank time deposits    
Held-to-maturity    
Amortized Cost 39.0 39.1
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Fair Value 39.0 39.1
Commercial paper    
Available-for-sale    
Amortized Cost 460.7 452.3
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Fair Value 460.7 452.3
U.S. government and agency securities    
Available-for-sale    
Amortized Cost 214.5 466.5
Gross Unrealized Gains 0.0 0.2
Gross Unrealized Losses (0.4) (0.4)
Fair Value 214.1 466.3
Asset-backed securities    
Available-for-sale    
Amortized Cost 39.4 35.6
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses (0.5) (0.6)
Fair Value 38.9 35.0
Corporate debt securities    
Available-for-sale    
Amortized Cost 636.9 347.2
Gross Unrealized Gains 0.0 0.1
Gross Unrealized Losses (0.6) (0.4)
Fair Value $ 636.3 $ 346.9