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Financial Instruments - Schedule Of Available-For-Sale Investments With Unrealized Losses (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months, fair value | $ 4,856.7 | $ 715.6
Unrealized losses less than 12 months | (31.2) | (0.2)
Unrealized losses 12 months or greater, fair value | 0.0 | 0.0
Unrealized losses 12 months or greater | 0.0 | 0.0
Total Fair Value | 4,856.7 | 715.6
Total Unrealized Losses | (31.2) | (0.2)
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 securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months, fair value | 1,687.9 | 352.7
Unrealized losses less than 12 months | (11.9) | (0.2)
Unrealized losses 12 months or greater, fair value | 0.0 | 0.0
Unrealized losses 12 months or greater | 0.0 | 0.0
Total Fair Value | 1,687.9 | 352.7
Total Unrealized Losses | (11.9) | (0.2)
U.S. treasuries |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months, fair value | 2,596.3 | 278.1
Unrealized losses less than 12 months | (15.4) | 0.0
Unrealized losses 12 months or greater, fair value | 0.0 | 0.0
Unrealized losses 12 months or greater | 0.0 | 0.0
Total Fair Value | 2,596.3 | 278.1
Total Unrealized Losses | (15.4) | 0.0
U.S. government agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months, fair value | 412.5 | 63.5
Unrealized losses less than 12 months | (2.9) | 0.0
Unrealized losses 12 months or greater, fair value | 0.0 | 0.0
Unrealized losses 12 months or greater | 0.0 | 0.0
Total Fair Value | 412.5 | 63.5
Total Unrealized Losses | (2.9) | 0.0
Municipal securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses less than 12 months, fair value | 156.0 | 21.3
Unrealized losses less than 12 months | (1.0) | 0.0
Unrealized losses 12 months or greater, fair value | 0.0 | 0.0
Unrealized losses 12 months or greater | 0.0 | 0.0
Total Fair Value | 156.0 | 21.3
Total Unrealized Losses | $ (1.0) | $ 0.0

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- Definition Amount of 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 more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 + Details
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