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Investment Securities - Unrealized Losses On Debt Securities (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than one year | $ 731.1 | $ 587.5
Gross unrealized losses, less than one year | 10.1 | 7.4
Fair value, one year or longer | 1,555.6 | 1,277.5
Gross unrealized losses, one year or longer | 120.0 | 96.9
Fair Value | 2,286.7 | 1,865.0
Gross Unrealized Losses | 130.1 | 104.3
U.S. treasury notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than one year | 23.1 | 0.0
Gross unrealized losses, less than one year | 0.2 | 0.0
Fair value, one year or longer | 356.3 | 358.6
Gross unrealized losses, one year or longer | 34.8 | 32.3
Fair Value | 379.4 | 358.6
Gross Unrealized Losses | 35.0 | 32.3
Corporate and sovereign debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than one year | 342.5 | 132.7
Gross unrealized losses, less than one year | 3.7 | 2.3
Fair value, one year or longer | 526.6 | 482.9
Gross unrealized losses, one year or longer | 31.6 | 29.3
Fair Value | 869.1 | 615.6
Gross Unrealized Losses | 35.3 | 31.6
Municipal bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than one year | 24.9 | 25.3
Gross unrealized losses, less than one year | 0.5 | 0.2
Fair value, one year or longer | 41.8 | 42.5
Gross unrealized losses, one year or longer | 6.6 | 6.0
Fair Value | 66.7 | 67.8
Gross Unrealized Losses | 7.1 | 6.2
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than one year | 51.3 | 55.0
Gross unrealized losses, less than one year | 0.4 | 0.2
Fair value, one year or longer | 78.9 | 131.1
Gross unrealized losses, one year or longer | 2.4 | 4.0
Fair Value | 130.2 | 186.1
Gross Unrealized Losses | 2.8 | 4.2
Mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than one year | 289.3 | 374.5
Gross unrealized losses, less than one year | 5.3 | 4.7
Fair value, one year or longer | 552.0 | 262.4
Gross unrealized losses, one year or longer | 44.6 | 25.3
Fair Value | 841.3 | 636.9
Gross Unrealized Losses | $ 49.9 | $ 30.0

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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/exampleRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479081/326-30-55-8 Reference 2: 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 3: 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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- 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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