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INVESTMENTS - Schedule of Investments in Debt Securities (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Held-to-maturity    
Fair Value $ 56.0  
Available-for-sale    
Amortized Cost 767.7 $ 926.1
Gross Unrealized Gains 0.1 0.1
Gross Unrealized Losses (18.0) (27.5)
Fair Value 749.8 898.7
Bank time deposits    
Held-to-maturity    
Amortized Cost 56.0 64.5
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Fair Value 56.0 64.5
U.S. government and agency securities    
Available-for-sale    
Amortized Cost 63.8 72.7
Gross Unrealized Gains 0.0 0.1
Gross Unrealized Losses (2.4) (2.8)
Fair Value 61.4 70.0
Asset-backed securities    
Available-for-sale    
Amortized Cost 148.0 192.1
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses (3.8) (7.8)
Fair Value 144.2 184.3
Corporate debt securities    
Available-for-sale    
Amortized Cost 553.1 658.5
Gross Unrealized Gains 0.1 0.0
Gross Unrealized Losses (11.7) (16.7)
Fair Value 541.5 641.8
Municipal securities    
Available-for-sale    
Amortized Cost 2.8 2.8
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses (0.1) (0.2)
Fair Value $ 2.7 $ 2.6