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Regulatory Matters - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]      
Cash dividends paid to parent Company by consolidated subsidiaries $ 600.0 $ 475.0 $ 360.0
Amount available to be paid as dividends without prior regulatory approval $ 929.8    
Minimum ratio of qualifying total capital to risk-weighted assets (as a percent) 0.080    
Tier 1 common equity capital required for capital adequacy to risk weighted assets (as a percent) 0.0450    
Tier 1 risk based capital required for capital adequacy to risk weighted assets (as a percent) 0.060    
Tier 1 leverage capital required for capital adequacy to average assets (as a percent) 0.040    
Ratio required for banks to be well capitalized, total capital to risk-weighted assets (as a percent) 0.100    
Ratio required for banks to be well capitalized, Tier 1 capital to risk-weighted assets (as a percent) 0.080    
Ratio required for banks to be well capitalized, common equity Tier 1 capital risk weighted assets (as a percent) 0.065    
Ratio required for banks to be well capitalized, Tier 1 leverage ratio (as a percent) 0.050