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Fair Value Measurements - Schedule of Fair Value of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments in unconsolidated subsidiaries $ 930.0 $ 997.0
Warehouse receivables 1,438.0 675.0
Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 43.0 68.0
Equity securities 17.0 41.0
Investments in unconsolidated subsidiaries 546.0 645.0
Warehouse receivables 1,438.0 675.0
Other assets 37.0 16.0
Total assets at fair value 2,081.0 1,445.0
Contingent consideration 37.0 36.0
Other liabilities 14.0 5.0
Total liabilities at fair value 51.0 41.0
Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 3.0 12.0
Equity securities 17.0 41.0
Investments in unconsolidated subsidiaries 78.0 168.0
Warehouse receivables 0.0 0.0
Other assets 0.0 0.0
Total assets at fair value 98.0 221.0
Contingent consideration 0.0 0.0
Other liabilities 0.0 0.0
Total liabilities at fair value 0.0 0.0
Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 40.0 56.0
Equity securities 0.0 0.0
Investments in unconsolidated subsidiaries 0.0 0.0
Warehouse receivables 1,438.0 675.0
Other assets 0.0 0.0
Total assets at fair value 1,478.0 731.0
Contingent consideration 0.0 0.0
Other liabilities 14.0 5.0
Total liabilities at fair value 14.0 5.0
Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 0.0 0.0
Equity securities 0.0 0.0
Investments in unconsolidated subsidiaries 468.0 477.0
Warehouse receivables 0.0 0.0
Other assets 37.0 16.0
Total assets at fair value 505.0 493.0
Contingent consideration 37.0 36.0
Other liabilities 0.0 0.0
Total liabilities at fair value 37.0 36.0
Recurring | U.S. treasury securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 3.0 12.0
Recurring | U.S. treasury securities | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 3.0 12.0
Recurring | U.S. treasury securities | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 0.0 0.0
Recurring | U.S. treasury securities | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 0.0 0.0
Recurring | Debt securities issued by U.S. federal agencies    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities   11.0
Recurring | Debt securities issued by U.S. federal agencies | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities   0.0
Recurring | Debt securities issued by U.S. federal agencies | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities   11.0
Recurring | Debt securities issued by U.S. federal agencies | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities   0.0
Recurring | Corporate debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 33.0 44.0
Recurring | Corporate debt securities | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 0.0 0.0
Recurring | Corporate debt securities | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 33.0 44.0
Recurring | Corporate debt securities | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 0.0 0.0
Recurring | Asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 7.0 1.0
Recurring | Asset-backed securities | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 0.0 0.0
Recurring | Asset-backed securities | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 7.0 1.0
Recurring | Asset-backed securities | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities $ 0.0 $ 0.0