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FINANCIAL INSTRUMENTS - Available-for-Sale Debt Securities in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
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Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses less than 12 months, fair value | $ 5,422.1 | $ 4,856.7
Unrealized losses less than 12 months, gross unrealized losses | (126.1) | (31.2)
Unrealized losses more than 12 months, fair value | 392.9 | 0.0
Unrealized losses more than 12 months, gross unrealized losses | (16.9) | 0.0
Total unrealized losses, fair value | 5,815.0 | 4,856.7
Total unrealized losses, gross unrealized losses | (143.0) | (31.2)
U.S. treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses less than 12 months, fair value | 2,807.4 | 2,596.3
Unrealized losses less than 12 months, gross unrealized losses | (59.6) | (15.4)
Unrealized losses more than 12 months, fair value | 303.5 | 0.0
Unrealized losses more than 12 months, gross unrealized losses | (12.2) | 0.0
Total unrealized losses, fair value | 3,110.9 | 2,596.3
Total unrealized losses, gross unrealized losses | (71.8) | (15.4)
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses less than 12 months, fair value | 6.9 | 4.0
Unrealized losses less than 12 months, gross unrealized losses | 0.0 | 0.0
Unrealized losses more than 12 months, fair value | 0.0 | 0.0
Unrealized losses more than 12 months, gross unrealized losses | 0.0 | 0.0
Total unrealized losses, fair value | 6.9 | 4.0
Total unrealized losses, gross unrealized losses | 0.0 | 0.0
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses less than 12 months, fair value | 1,935.7 | 1,687.9
Unrealized losses less than 12 months, gross unrealized losses | (49.2) | (11.9)
Unrealized losses more than 12 months, fair value | 78.5 | 0.0
Unrealized losses more than 12 months, gross unrealized losses | (4.1) | 0.0
Total unrealized losses, fair value | 2,014.2 | 1,687.9
Total unrealized losses, gross unrealized losses | (53.3) | (11.9)
U.S. government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses less than 12 months, fair value | 506.9 | 412.5
Unrealized losses less than 12 months, gross unrealized losses | (12.9) | (2.9)
Unrealized losses more than 12 months, fair value | 10.9 | 0.0
Unrealized losses more than 12 months, gross unrealized losses | (0.6) | 0.0
Total unrealized losses, fair value | 517.8 | 412.5
Total unrealized losses, gross unrealized losses | (13.5) | (2.9)
Municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses less than 12 months, fair value | 165.2 | 156.0
Unrealized losses less than 12 months, gross unrealized losses | (4.4) | (1.0)
Unrealized losses more than 12 months, fair value | 0.0 | 0.0
Unrealized losses more than 12 months, gross unrealized losses | 0.0 | 0.0
Total unrealized losses, fair value | 165.2 | 156.0
Total unrealized losses, gross unrealized losses | $ (4.4) | $ (1.0)

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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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