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Debt Securities - Gross Unrealized Losses and Fair Value Available-For-Sale Investments in Unrealized Loss Position (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
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Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | $ 49.5 | $ 32.1
Less Than 12 Months, Unrealized Loss | (0.1) | (0.2)
12 Months or Longer, Fair Value | 0.0 | 0.0
12 Months or Longer, Unrealized Loss | 0.0 | 0.0
Total, Fair Value | 49.5 | 32.1
Total, Unrealized Loss | (0.1) | (0.2)
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 125.4 | 199.5
Less Than 12 Months, Unrealized Loss | (1.1) | (1.9)
12 Months or Longer, Fair Value | 307.5 | 299.1
12 Months or Longer, Unrealized Loss | (4.5) | (5.6)
Total, Fair Value | 432.9 | 498.6
Total, Unrealized Loss | (5.6) | (7.5)
Securities of government-sponsored entities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 34.3 | 107.7
Less Than 12 Months, Unrealized Loss | (0.2) | (2.5)
12 Months or Longer, Fair Value | 199.5 | 198.4
12 Months or Longer, Unrealized Loss | (4.2) | (4.5)
Total, Fair Value | 233.8 | 306.1
Total, Unrealized Loss | $ (4.4) | $ (7.0)

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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 https://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 https://asc.fasb.org/extlink&oid=126970911&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 https://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 https://asc.fasb.org/extlink&oid=126970911&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 https://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 + Details
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