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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 114.1	$ 83.2	$ 226.3	$ 224.9
Other comprehensive income (loss):
Change in foreign currency translation adjustments	(3.3)	(4.7)	(3.7)	(10.2)
Change in net unrealized gains and losses on short-term investments	4.6	(12.5)	15.7	(45.3)
Total other comprehensive income (loss)	1.3	(17.2)	12.0	(55.5)
Comprehensive income	$ 115.4	$ 66.0	$ 238.3	$ 169.4

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