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Financial Instruments - Schedule Of Available-For-Sale Investments With Unrealized Losses (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months, fair value | $ 132.5 | $ 1,510.4
Unrealized losses less than 12 months | (0.1) | (49.1)
Unrealized losses 12 months or greater, fair value | 2,595.1 | 3,538.3
Unrealized losses 12 months or greater | (60.4) | (149.4)
Total Fair Value | 2,727.6 | 5,048.7
Total Unrealized Losses | (60.5) | (198.5)
U.S. treasuries |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months, fair value | 48.5 | 731.7
Unrealized losses less than 12 months | 0.0 | (26.0)
Unrealized losses 12 months or greater, fair value | 1,112.9 | 1,886.9
Unrealized losses 12 months or greater | (25.4) | (70.6)
Total Fair Value | 1,161.4 | 2,618.6
Total Unrealized Losses | (25.4) | (96.6)
Corporate debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months, fair value | 54.2 | 631.4
Unrealized losses less than 12 months | (0.1) | (17.6)
Unrealized losses 12 months or greater, fair value | 1,219.2 | 1,221.9
Unrealized losses 12 months or greater | (25.8) | (58.4)
Total Fair Value | 1,273.4 | 1,853.3
Total Unrealized Losses | (25.9) | (76.0)
U.S. government agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months, fair value | 29.8 | 102.7
Unrealized losses less than 12 months | 0.0 | (4.4)
Unrealized losses 12 months or greater, fair value | 185.6 | 324.6
Unrealized losses 12 months or greater | (7.3) | (15.5)
Total Fair Value | 215.4 | 427.3
Total Unrealized Losses | (7.3) | (19.9)
Municipal securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months, fair value | 0.0 | 44.6
Unrealized losses less than 12 months | 0.0 | (1.1)
Unrealized losses 12 months or greater, fair value | 77.4 | 104.9
Unrealized losses 12 months or greater | (1.9) | (4.9)
Total Fair Value | 77.4 | 149.5
Total Unrealized Losses | $ (1.9) | $ (6.0)

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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-7 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-5 + Details
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