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Financial Instruments - Schedule Of Available-For-Sale Investments With Unrealized Losses (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Schedule of Available-for-sale Securities [Line Items]    
Unrealized losses less than 12 months, fair value $ 1,510.4 $ 4,856.7
Unrealized losses less than 12 months (49.1) (31.2)
Unrealized losses 12 months or greater, fair value 3,538.3 0.0
Unrealized losses 12 months or greater (149.4) 0.0
Total Fair Value 5,048.7 4,856.7
Total Unrealized Losses (198.5) (31.2)
Commercial paper    
Schedule of Available-for-sale Securities [Line Items]    
Unrealized losses less than 12 months, fair value   4.0
Unrealized losses less than 12 months   0.0
Unrealized losses 12 months or greater, fair value   0.0
Unrealized losses 12 months or greater   0.0
Total Fair Value   4.0
Total Unrealized Losses   0.0
Corporate debt securities    
Schedule of Available-for-sale Securities [Line Items]    
Unrealized losses less than 12 months, fair value 631.4 1,687.9
Unrealized losses less than 12 months (17.6) (11.9)
Unrealized losses 12 months or greater, fair value 1,221.9 0.0
Unrealized losses 12 months or greater (58.4) 0.0
Total Fair Value 1,853.3 1,687.9
Total Unrealized Losses (76.0) (11.9)
U.S. treasuries    
Schedule of Available-for-sale Securities [Line Items]    
Unrealized losses less than 12 months, fair value 731.7 2,596.3
Unrealized losses less than 12 months (26.0) (15.4)
Unrealized losses 12 months or greater, fair value 1,886.9 0.0
Unrealized losses 12 months or greater (70.6) 0.0
Total Fair Value 2,618.6 2,596.3
Total Unrealized Losses (96.6) (15.4)
U.S. government agencies    
Schedule of Available-for-sale Securities [Line Items]    
Unrealized losses less than 12 months, fair value 102.7 412.5
Unrealized losses less than 12 months (4.4) (2.9)
Unrealized losses 12 months or greater, fair value 324.6 0.0
Unrealized losses 12 months or greater (15.5) 0.0
Total Fair Value 427.3 412.5
Total Unrealized Losses (19.9) (2.9)
Municipal securities    
Schedule of Available-for-sale Securities [Line Items]    
Unrealized losses less than 12 months, fair value 44.6 156.0
Unrealized losses less than 12 months (1.1) (1.0)
Unrealized losses 12 months or greater, fair value 104.9 0.0
Unrealized losses 12 months or greater (4.9) 0.0
Total Fair Value 149.5 156.0
Total Unrealized Losses $ (6.0) $ (1.0)