v3.26.1
Investments - Investments in Unconsolidated Affiliates (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Schedule of Equity Method Investments [Line Items]      
Investments in unconsolidated affiliates $ 634.5   $ 643.5
Equity in earnings (loss) of unconsolidated affiliates $ (5.8) $ (1.9)  
BKFC      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage 44.50%    
Investments in unconsolidated affiliates $ 142.4   147.3
Equity in earnings (loss) of unconsolidated affiliates $ (4.4) (10.4)  
JANA      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage 50.00%    
Investments in unconsolidated affiliates $ 140.3   141.1
Equity in earnings (loss) of unconsolidated affiliates $ 0.4 2.4  
CSI      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage 6.40%    
Investments in unconsolidated affiliates $ 101.2   101.2
Equity in earnings (loss) of unconsolidated affiliates $ 0.0 15.7  
Watkins      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage 49.10%    
Investments in unconsolidated affiliates $ 74.5   73.2
Equity in earnings (loss) of unconsolidated affiliates $ 2.8 (4.7)  
Alight      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage 7.70%    
Investments in unconsolidated affiliates $ 71.6   73.8
Equity in earnings (loss) of unconsolidated affiliates $ (2.1) (1.9)  
JANA Fund      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage 2.90%    
Investments in unconsolidated affiliates $ 48.9   50.2
Equity in earnings (loss) of unconsolidated affiliates (1.3) 0.0  
Other      
Schedule of Equity Method Investments [Line Items]      
Investments in unconsolidated affiliates 55.6   $ 56.7
Equity in earnings (loss) of unconsolidated affiliates $ (1.2) $ (3.0)