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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
Mar. 31, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments in unconsolidated subsidiaries $ 901.7 $ 997.3
Warehouse receivables 848.0 675.0
Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 69.0 68.0
Equity securities 83.0 41.0
Investments in unconsolidated subsidiaries 575.0 645.0
Warehouse receivables 848.0 675.0
Other assets 22.0 16.0
Total assets at fair value 1,597.0 1,445.0
Contingent consideration 43.0 36.0
Other liabilities 1.0 5.0
Total liabilities at fair value 44.0 41.0
Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 12.0 12.0
Equity securities 83.0 41.0
Investments in unconsolidated subsidiaries 117.0 168.0
Warehouse receivables 0.0 0.0
Other assets 0.0 0.0
Total assets at fair value 212.0 221.0
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 57.0 56.0
Equity securities 0.0 0.0
Investments in unconsolidated subsidiaries 0.0 0.0
Warehouse receivables 848.0 675.0
Other assets 4.0 0.0
Total assets at fair value 909.0 731.0
Contingent consideration 0.0 0.0
Other liabilities 1.0 5.0
Total liabilities at fair value 1.0 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 458.0 477.0
Warehouse receivables 0.0 0.0
Other assets 18.0 16.0
Total assets at fair value 476.0 493.0
Contingent consideration 43.0 36.0
Other liabilities 0.0 0.0
Total liabilities at fair value 43.0 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 12.0 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 12.0 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 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 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 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 0.0
Recurring | Corporate debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 45.0 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 45.0 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 1.0 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 1.0 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