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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement of Comprehensive Income [Abstract]      
Net income $ 846.6 $ 825.7 $ 821.3
Change in unrealized gains (losses) on marketable securities:      
Unrealized gains (losses) arising during the period, net of tax 21.2 45.8 (9.8)
Losses (gains) reclassified into earnings, net of tax (3.4) (0.6) 1.4
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Total 17.8 45.2 (8.4)
Change in unrealized gains (losses) on cash flow hedges:      
Unrealized gains (losses) arising during the period, net of tax 6.4 2.2 (4.6)
Losses (gains) reclassified into earnings, net of tax (5.2) (1.2) 4.1
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Total 1.2 1.0 (0.5)
Other comprehensive income (loss), net of tax 19.0 46.2 (8.9)
Comprehensive income $ 865.6 $ 871.9 $ 812.4