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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 142.7	$ 151.8
Other comprehensive income, net of reclassifications and tax (Note 9):
Unrealized gains/(losses) on investment securities	(4.6)	20.0
Unrealized gains/(losses) on hedging activities	10.8	(10.3)
Total other comprehensive income	6.2	9.7
Comprehensive income	$ 148.9	$ 161.5

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