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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