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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 910.6	$ 805.8	$ 744.3
Other comprehensive income, net of reclassifications and tax (Note 14):
Unrealized gains/(losses) on investment securities	(99.8)	(27.9)	33.6
Unrealized gains/(losses) on hedging activities	1.8	49.2	(26.9)
Foreign currency translation adjustments	(17.8)
Defined benefit pension plan adjustments (Note 12)		86.1	42.8
Total other comprehensive income/(loss)	(115.8)	107.4	49.5
Comprehensive income	$ 794.8	$ 913.2	$ 793.8

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