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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 $ 840.3 $ 796.9 $ 815.6
Change in unrealized gains (losses) on marketable securities:      
Unrealized gains (losses) arising during the period, net of tax 49.1 (93.4) (38.5)
Losses (gains) reclassified into earnings, net of tax 5.2 [1] (1.7)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Total 54.3 (93.4) (40.2)
Change in unrealized gains (losses) on cash flow hedges:      
Unrealized losses arising during the period, net of tax (12.0) (25.4) (0.1)
Losses (gains) reclassified into earnings, net of tax 16.4 21.5 (1.0)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Total 4.4 (3.9) (1.1)
Other comprehensive income (loss), net of tax 58.7 (97.3) (41.3)
Comprehensive income $ 899.0 $ 699.6 $ 774.3
[1] Represents an amount lower than 0.1