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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 110.5	$ 43.2	$ 242.8	$ 112.2
Other comprehensive income (loss):
Change in foreign currency translation adjustments	(1.0)	0.3	(2.1)	(0.4)
Change in net unrealized gains and losses on short-term investments	2.8	0.8	5.0	11.1
Total other comprehensive income	1.8	1.1	2.9	10.7
Comprehensive income	$ 112.3	$ 44.3	$ 245.7	$ 122.9

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