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Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Statement of Comprehensive Income [Abstract]
Net income attributable to shareholders	$ 77.7	$ 71.5
Other comprehensive (loss) income, net of tax:
Unrealized (loss) gain on available-for-sale debt securities	(46.5)	48.7
Foreign currency translation	(3.7)	18.4
Other comprehensive (loss) income, net of tax	(50.2)	67.1
Comprehensive income	$ 27.5	$ 138.6

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