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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
Dec. 31, 2023
Dec. 31, 2022
Assets:    
Notes receivable, net $ 22.4 $ 10.7
Carrying Amount    
Assets:    
Cash and cash equivalents 3,605.3 1,223.5
Deposits with banks 55.8 63.4
Notes receivable, net 22.4 10.7
Secured financings receivable 636.5 422.7
Liabilities:    
Secured financings payable 553.3 366.3
Notes and contracts payable 1,393.9 1,645.8
Estimated Fair Value    
Assets:    
Cash and cash equivalents 3,605.3 1,223.5
Deposits with banks 55.6 62.7
Notes receivable, net 23.2 10.6
Secured financings receivable 636.5 422.7
Liabilities:    
Secured financings payable 553.3 366.3
Notes and contracts payable 1,219.6 1,404.4
Estimated Fair Value | Level 1    
Assets:    
Cash and cash equivalents 3,605.3 1,223.5
Deposits with banks 4.0 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 51.6 54.2
Notes receivable, net 0.0 0.0
Secured financings receivable 636.5 422.7
Liabilities:    
Secured financings payable 553.3 366.3
Notes and contracts payable 1,215.4 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 23.2 10.6
Secured financings receivable 0.0 0.0
Liabilities:    
Secured financings payable 0.0 0.0
Notes and contracts payable $ 4.2 $ 3.8