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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Statement of Comprehensive Income [Abstract]      
Net income $ 626.0 $ 910.6 $ 805.8
Other comprehensive income, net of reclassifications and tax (Note 13):      
Unrealized gains/(losses) on investment securities 36.4 (99.8) (27.9)
Unrealized gains/(losses) on hedging activities (35.8) 1.8 49.2
Foreign currency translation adjustments   (17.8)  
Defined benefit pension plan adjustments (Note 11)     86.1
Total other comprehensive income/(loss) 0.6 (115.8) 107.4
Comprehensive income $ 626.6 $ 794.8 $ 913.2