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Investments - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Schedule of Investments [Line Items]    
Deferred compensation liabilities [1] $ (9.4) $ (11.5)
Total 2,795.8 2,670.7
Quoted prices in Active Markets for Identical Assets (Level 1) [Member]    
Schedule of Investments [Line Items]    
Deferred compensation liabilities [1] (9.4) (11.5)
Total 2,795.8 2,670.7
Significant Other Observable Inputs (Level 2) [Member]    
Schedule of Investments [Line Items]    
Deferred compensation liabilities [1] 0.0 0.0
Total 0.0 0.0
Significant Unobservable Inputs (Level 3) [Member]    
Schedule of Investments [Line Items]    
Deferred compensation liabilities [1] 0.0 0.0
Total 0.0 0.0
Money Market Funds [Member]    
Schedule of Investments [Line Items]    
Investments measured at fair value [2] 2,759.2 2,637.5
Money Market Funds [Member] | Quoted prices in Active Markets for Identical Assets (Level 1) [Member]    
Schedule of Investments [Line Items]    
Investments measured at fair value [2] 2,759.2 2,637.5
Money Market Funds [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Schedule of Investments [Line Items]    
Investments measured at fair value [2] 0.0 0.0
Money Market Funds [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Schedule of Investments [Line Items]    
Investments measured at fair value [2] 0.0 0.0
Marketable Equity Securities [Member]    
Schedule of Investments [Line Items]    
Investments measured at fair value [3] 19.6 21.6
Marketable Equity Securities [Member] | Quoted prices in Active Markets for Identical Assets (Level 1) [Member]    
Schedule of Investments [Line Items]    
Investments measured at fair value [3] 19.6 21.6
Marketable Equity Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Schedule of Investments [Line Items]    
Investments measured at fair value [3] 0.0 0.0
Marketable Equity Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Schedule of Investments [Line Items]    
Investments measured at fair value [3] 0.0 0.0
Seed Capital Investments    
Schedule of Investments [Line Items]    
Investments measured at fair value [3] 26.4 23.1
Seed Capital Investments | Quoted prices in Active Markets for Identical Assets (Level 1) [Member]    
Schedule of Investments [Line Items]    
Investments measured at fair value [3] 26.4 23.1
Seed Capital Investments | Significant Other Observable Inputs (Level 2) [Member]    
Schedule of Investments [Line Items]    
Investments measured at fair value [3] 0.0 0.0
Seed Capital Investments | Significant Unobservable Inputs (Level 3) [Member]    
Schedule of Investments [Line Items]    
Investments measured at fair value [3] $ 0.0 $ 0.0
[1] Included in other long-term liabilities on the Consolidated Balance Sheet.
[2] As of December 31, 2025, included $76.6 million of cash and cash equivalents, $1.3 million of restricted cash and cash equivalents and $2,681.3 million of funds receivable and funds held on behalf of clients on the Consolidated Balance Sheet. As of December 31, 2024, included $184.2 million of cash and cash equivalents, $2.5 million of restricted cash and cash equivalents and $2,450.8 million of funds receivable and funds held on behalf of clients on the Consolidated Balance Sheet.
[3] Included in investments on the Consolidated Balance Sheet.