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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 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Carrying Amount |  |
Assets: |  |
Cash and cash equivalents | $ 1,506.4 | $ 3,605.3
Deposits with banks | 77.1 | 55.8
Notes receivable, net | 23.8 | 22.4
Secured financings receivable | 831.4 | 636.5
Liabilities: |  |
Secured financings payable | 688.8 | 553.3
Notes and contracts payable | 1,396.0 | 1,393.9
Estimated Fair Value |  |
Assets: |  |
Cash and cash equivalents | 1,506.4 | 3,605.3
Deposits with banks | 77.0 | 55.6
Notes receivable, net | 24.6 | 23.2
Secured financings receivable | 831.4 | 636.5
Liabilities: |  |
Secured financings payable | 688.8 | 553.3
Notes and contracts payable | 1,226.3 | 1,219.6
Estimated Fair Value | Level 1 |  |
Assets: |  |
Cash and cash equivalents | 1,506.4 | 3,605.3
Deposits with banks | 20.1 | 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 | 56.9 | 51.6
Notes receivable, net | 0.0 | 0.0
Secured financings receivable | 831.4 | 636.5
Liabilities: |  |
Secured financings payable | 688.8 | 553.3
Notes and contracts payable | 1,220.5 | 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 | 24.6 | 23.2
Secured financings receivable | 0.0 | 0.0
Liabilities: |  |
Secured financings payable | 0.0 | 0.0
Notes and contracts payable | $ 5.8 | $ 4.2

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