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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, 2023 | Dec. 31, 2022
--- | --- | ---
Carrying Amount |  |
Assets: |  |
Cash and cash equivalents | $ 1,983.4 | $ 1,223.5
Deposits with banks | 53.5 | 63.4
Notes receivable, net | 11.5 | 10.7
Secured financings receivable | 595.3 | 422.7
Liabilities: |  |
Secured financings payable | 502.9 | 366.3
Notes and contracts payable | 1,394.5 | 1,645.8
Estimated Fair Value |  |
Assets: |  |
Cash and cash equivalents | 1,983.4 | 1,223.5
Deposits with banks | 53.0 | 62.7
Notes receivable, net | 11.0 | 10.6
Secured financings receivable | 595.3 | 422.7
Liabilities: |  |
Secured financings payable | 502.9 | 366.3
Notes and contracts payable | 1,210.7 | 1,404.4
Estimated Fair Value | Level 1 |  |
Assets: |  |
Cash and cash equivalents | 1,983.4 | 1,223.5
Deposits with banks | 4.6 | 8.5
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 | 48.4 | 54.2
Notes receivable, net | 0.0 | 0.0
Secured financings receivable | 595.3 | 422.7
Liabilities: |  |
Secured financings payable | 502.9 | 366.3
Notes and contracts payable | 1,207.6 | 1,400.6
Estimated Fair Value | Level 3 |  |
Assets: |  |
Cash and cash equivalents | 0.0 | 0.0
Deposits with banks | 0.0 | 0.0
Notes receivable, net | 11.0 | 10.6
Secured financings receivable | 0.0 | 0.0
Liabilities: |  |
Secured financings payable | 0.0 | 0.0
Notes and contracts payable | $ 3.1 | $ 3.8

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