INVESTMENTS - Schedule of Investments in Short-Term and Long-Term Debt Securities (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Held-to-maturity
Fair Value	$ 39.0
Available-for-sale
Amortized Cost	1,537.5	$ 1,301.6
Gross Unrealized Gains	0.1	0.3
Gross Unrealized Losses	(1.9)	(1.4)
Fair Value	1,535.7	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	518.3	452.3
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	518.3	452.3
U.S. government and agency securities
Available-for-sale
Amortized Cost	260.7	466.5
Gross Unrealized Gains	0.0	0.2
Gross Unrealized Losses	(0.5)	(0.4)
Fair Value	260.2	466.3
Asset-backed securities
Available-for-sale
Amortized Cost	33.2	35.6
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(0.4)	(0.6)
Fair Value	32.8	35.0
Corporate debt securities
Available-for-sale
Amortized Cost	725.3	347.2
Gross Unrealized Gains	0.1	0.1
Gross Unrealized Losses	(1.0)	(0.4)
Fair Value	$ 724.4	$ 346.9

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