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Fair Value Measurements - Carrying Amounts and Estimated Fair Values of Financial Instruments Not Measured at Fair Value (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Carrying Amount |  |
Assets: |  |
Cash and cash equivalents | $ 2,953.4 | $ 3,605.3
Deposits with banks | 55.4 | 55.8
Notes receivable, net | 28.0 | 22.4
Secured financings receivable | 984.0 | 636.5
Liabilities: |  |
Secured financings payable | 878.2 | 553.3
Notes and contracts payable | 1,847.7 | 1,393.9
Estimated Fair Value |  |
Assets: |  |
Cash and cash equivalents | 2,953.4 | 3,605.3
Deposits with banks | 55.4 | 55.6
Notes receivable, net | 29.1 | 23.2
Secured financings receivable | 984.0 | 636.5
Liabilities: |  |
Secured financings payable | 878.8 | 553.3
Notes and contracts payable | 1,732.8 | 1,219.6
Estimated Fair Value | Level 1 |  |
Assets: |  |
Cash and cash equivalents | 2,953.4 | 3,605.3
Deposits with banks | 2.9 | 4.0
Notes receivable, net | 0.0 | 0.0
Secured financings receivable | 0.0 | 0.0
Liabilities: |  |
Secured financings payable | 0.0 | 0.0
Notes and contracts payable | 0.0 | 0.0
Estimated Fair Value | Level 2 |  |
Assets: |  |
Cash and cash equivalents | 0.0 | 0.0
Deposits with banks | 52.5 | 51.6
Notes receivable, net | 0.0 | 0.0
Secured financings receivable | 984.0 | 636.5
Liabilities: |  |
Secured financings payable | 878.8 | 553.3
Notes and contracts payable | 1,720.2 | 1,215.4
Estimated Fair Value | Level 3 |  |
Assets: |  |
Cash and cash equivalents | 0.0 | 0.0
Deposits with banks | 0.0 | 0.0
Notes receivable, net | 29.1 | 23.2
Secured financings receivable | 0.0 | 0.0
Liabilities: |  |
Secured financings payable | 0.0 | 0.0
Notes and contracts payable | $ 12.6 | $ 4.2

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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