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INVESTMENTS - Schedule of Investments in Debt Securities (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Held-to-maturity    
Fair Value $ 53.0  
Available-for-sale    
Amortized Cost 827.8 $ 1,026.4
Gross Unrealized Gains 0.1 0.2
Gross Unrealized Losses (3.9) (5.3)
Fair Value 824.0 1,021.3
Bank time deposits    
Held-to-maturity    
Amortized Cost 53.0 57.9
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Fair Value 53.0 57.9
Available-for-sale    
Amortized Cost 10.1 13.9
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Fair Value 10.1 13.9
Commercial paper    
Available-for-sale    
Amortized Cost 255.6 236.5
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Fair Value 255.6 236.5
U.S. government and agency securities    
Available-for-sale    
Amortized Cost 267.3 238.1
Gross Unrealized Gains 0.0 0.1
Gross Unrealized Losses (0.8) (1.1)
Fair Value 266.5 237.1
Asset-backed securities    
Available-for-sale    
Amortized Cost 59.3 70.2
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses (1.2) (1.4)
Fair Value 58.1 68.8
Corporate debt securities    
Available-for-sale    
Amortized Cost 232.7 465.0
Gross Unrealized Gains 0.1 0.1
Gross Unrealized Losses (1.9) (2.8)
Fair Value 230.9 462.3
Municipal securities    
Available-for-sale    
Amortized Cost 2.8 2.7
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Fair Value $ 2.8 $ 2.7