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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, 2025
Dec. 31, 2024
Carrying Amount    
Assets:    
Cash and cash equivalents $ 2,911.5 $ 1,718.1
Deposits with banks 80.0 85.4
Notes receivable, net 38.6 34.4
Secured financings receivable 1,171.0 690.0
Liabilities:    
Secured financings payable 1,078.4 643.8
Notes and contracts payable 1,545.5 1,546.6
Estimated Fair Value    
Assets:    
Cash and cash equivalents 2,911.5 1,718.1
Deposits with banks 79.7 85.3
Notes receivable, net 39.3 34.6
Secured financings receivable 1,171.0 690.0
Liabilities:    
Secured financings payable 1,078.4 643.8
Notes and contracts payable 1,459.3 1,399.4
Estimated Fair Value | Level 1    
Assets:    
Cash and cash equivalents 2,911.5 1,718.1
Deposits with banks 12.9 20.7
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 66.8 64.6
Notes receivable, net 0.0 0.0
Secured financings receivable 1,171.0 690.0
Liabilities:    
Secured financings payable 1,078.4 643.8
Notes and contracts payable 1,450.9 1,388.4
Estimated Fair Value | Level 3    
Assets:    
Cash and cash equivalents 0.0 0.0
Deposits with banks 0.0 0.0
Notes receivable, net 39.3 34.6
Secured financings receivable 0.0 0.0
Liabilities:    
Secured financings payable 0.0 0.0
Notes and contracts payable $ 8.4 $ 11.0