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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 452.3	$ 453.6	$ 553.2
Other comprehensive income (loss):
Change in foreign currency translation adjustments	(2.2)	0.2	(7.1)
Change in net unrealized gains and (losses) on short-term investments	13.6	27.2	(39.2)
Total other comprehensive income (loss)	11.4	27.4	(46.3)
Comprehensive income	$ 463.7	$ 481.0	$ 506.9

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