v3.26.1
Business Combinations - Estimated Fair Values of Aggregate Assets and Liabilities Acquired (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Fair Value Of Assets And Liabilities Statement [Line Items]    
Cash paid $ 31  
Other payable (18)  
Recorded earn-out payable 8 $ 17
Total consideration 21  
Maximum potential earn-out payable 18  
Allocation of purchase price:    
Cash and cash equivalents, inclusive of fiduciary cash 1  
Commission, fees, and other receivables (29)  
Fiduciary receivables 19  
Other current assets (21)  
Goodwill 137  
Other assets 26  
Total assets acquired 65  
Fiduciary liabilities (21)  
Other current liabilities (24)  
Deferred income tax, net 10  
Other liabilities (9)  
Total liabilities assumed (44)  
Net assets acquired 21  
Purchased Customer Accounts and Other    
Allocation of purchase price:    
Purchased customer accounts and other intangibles (68)  
Measurement Period Adjustments    
Fair Value Of Assets And Liabilities Statement [Line Items]    
Cash paid (13)  
Allocation of purchase price:    
Goodwill 106  
Measurement Period Adjustments | Retail & Specialty Distribution    
Fair Value Of Assets And Liabilities Statement [Line Items]    
Cash paid (13)  
Other payable (19)  
Recorded earn-out payable 0  
Total consideration (32)  
Maximum potential earn-out payable 0  
Allocation of purchase price:    
Cash and cash equivalents, inclusive of fiduciary cash 0  
Commission, fees, and other receivables (29)  
Fiduciary receivables 19  
Other current assets (25)  
Goodwill 106  
Other assets 27  
Total assets acquired 9  
Fiduciary liabilities 20  
Other current liabilities 24  
Deferred income tax, net 12  
Other liabilities 9  
Total liabilities assumed 41  
Net assets acquired (32)  
Measurement Period Adjustments | Retail & Specialty Distribution | Purchased Customer Accounts and Other    
Allocation of purchase price:    
Purchased customer accounts and other intangibles (89)  
Other Acquisitions | Retail & Specialty Distribution    
Fair Value Of Assets And Liabilities Statement [Line Items]    
Cash paid 44  
Other payable 1  
Recorded earn-out payable 8  
Total consideration 53  
Maximum potential earn-out payable 18  
Allocation of purchase price:    
Cash and cash equivalents, inclusive of fiduciary cash 1  
Commission, fees, and other receivables 0  
Fiduciary receivables 0  
Other current assets 4  
Goodwill 31  
Other assets (1)  
Total assets acquired 56  
Fiduciary liabilities 1  
Other current liabilities 0  
Deferred income tax, net (2)  
Other liabilities 0  
Total liabilities assumed 3  
Net assets acquired 53  
Other Acquisitions | Retail & Specialty Distribution | Purchased Customer Accounts and Other    
Allocation of purchase price:    
Purchased customer accounts and other intangibles $ 21