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Borrowings - Credit Agreement (Details) |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |
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Feb. 19, 2025 USD ($) | Jun. 21, 2024 USD ($) | Dec. 12, 2023 USD ($) | Jan. 13, 2023 USD ($) | Jan. 31, 2022 USD ($) swap | Dec. 31, 2023 USD ($) swap | Dec. 31, 2025 USD ($) | Nov. 30, 2025 USD ($) | Sep. 23, 2025 USD ($) | Jan. 31, 2025 USD ($) | Dec. 31, 2024 USD ($) | Sep. 30, 2024 USD ($) | Jun. 30, 2024 USD ($) | Jan. 13, 2022 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee (as a percent) |  |  |  |  |  |  | 0.50% |  |  |  |  |  |  |
Receivables from broker-dealers and clearing organizations |  |  |  |  |  |  | $ 1,896,405,000 |  |  |  | $ 1,100,850,000 |  |  |
Total principal of long-term borrowings |  |  |  |  |  |  | 2,067,334,000 |  |  |  | 1,767,265,000 |  |  |
Interest Rate Swap |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative contract term |  |  |  |  | 5 years | 2 years |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  | $ 525,000,000.0 | $ 1,525,000,000 |  |  |  |  |  |  | $ 1,075,000,000 |
Fixed interest rate percentage (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 4.50% |  |
January 2022 Interest Rate Swap |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative contract term |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  | $ 1,000,000,000 |  |  |  |  |  |  |  |  |
Number of interest rate swaps | swap |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
Fixed interest rate percentage (as a percent) |  |  |  |  |  |  |  |  |  | 4.60% |  |  |  |
December 2023 Interest Rate Swap |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative contract term |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  | $ 1,525,000,000 |  |  |  |  |  |  |  |
Number of interest rate swaps | swap |  |  |  |  |  | 2 |  |  |  |  |  |  |  |
Fixed interest rate percentage (as a percent) |  |  |  |  |  | 7.50% |  |  |  |  |  |  |  |
Receivables from broker-dealers and clearing organizations |  |  |  |  |  | $ 55,800,000 |  |  |  |  |  |  |  |
June 2024 Interest Rate Swap |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  | 1,525,000,000 |  | $ 1,075,000,000 |  |  |  |  |  |
Receivables from broker-dealers and clearing organizations |  |  |  |  |  | 2,000,000.0 |  |  |  |  |  |  |  |
Reclassification from AOCI to other income |  | $ 5,700,000 |  |  |  |  |  |  |  |  |  |  |  |
Committed facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total principal of long-term borrowings |  |  |  |  |  |  | $ 0 |  |  |  | $ 0 |  |  |
Committed facility | Scenario 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin (as a percent) |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |
Committed facility | Scenario 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin (as a percent) |  |  |  |  |  |  | 1.50% |  |  |  |  |  |  |
Committed facility | SOFR |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin (as a percent) |  |  |  |  |  |  | 2.50% |  |  |  |  |  |  |
Committed facility | SOFR | Scenario 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin (as a percent) |  |  |  |  |  |  | 0.00% |  |  |  |  |  |  |
Committed facility | VFH |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 250,000,000.0
Letter of credit | VFH |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,000,000.0
Swingline subfacility | VFH |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,000,000.0
Amended Credit Agreement | Overnight Bank Funding Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin (as a percent) |  |  |  |  |  |  | 0.50% |  |  |  |  |  |  |
Amended Credit Agreement | SOFR |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin (as a percent) |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |
Senior Secured Second Lien Notes | Scenario 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee stepdown (as a percent) |  |  |  |  |  |  | 0.375% |  |  |  |  |  |  |
Senior Secured Second Lien Notes | Scenario 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee stepdown (as a percent) |  |  |  |  |  |  | 0.25% |  |  |  |  |  |  |
First Lien Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt amortization, percentage of original aggregate principal amount |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |
Repayments of term loan |  |  | $ 55,000,000.0 | $ 18,000,000.0 |  |  |  |  |  |  |  |  |  |
First Lien Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term debt |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |
First Lien Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,800,000,000
First Lien Term Loan | First Lien Notes Due 2031 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  | 500,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Term Loan | Interest Rate Swap |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total principal of long-term borrowings |  |  |  |  |  |  | $ 1,545,000,000 |  |  |  |  |  |  |
Term Loan | June 2024 Interest Rate Swap |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate percentage (as a percent) |  |  |  |  |  |  |  | 7.17% |  |  |  |  |  |
Term Loan | Scenario 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin (as a percent) |  |  |  |  |  |  | 1.50% |  |  |  |  |  |  |
Term Loan | Scenario 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin (as a percent) |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |
Term Loan | SOFR |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin (as a percent) |  |  |  |  |  |  | 3.00% |  |  |  |  |  |  |
Term Loan | SOFR | Scenario 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin (as a percent) |  |  |  |  |  |  | 0.50% |  |  |  |  |  |  |
Term Loan | VFH | Interest Rate Swap |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  | $ 1,525,000,000 |  | $ 1,075,000,000 |  | $ 1,000,000,000 |  | $ 525,000,000.0 |  |
Fixed interest rate percentage (as a percent) |  |  |  |  |  |  |  | 6.92% |  |  |  |  |  |
Line of credit | First Lien Notes Due 2031 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  | $ 1,245,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |
Line of credit | First Lien Notes Due 2031 | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total principal of long-term borrowings |  | $ 250,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Line of credit | First Lien Notes Due 2031 | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total principal of long-term borrowings |  | $ 300,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Line of credit | New Term Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount | $ 1,245,000,000 |  |  |  |  |  |  |  | $ 1,545,000,000 |  |  |  |  |
Total principal of long-term borrowings |  |  |  |  |  |  |  |  | $ 300,000,000.0 |  |  |  |  |
Line of credit | Component one | New Term Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin (as a percent) | 1.50% |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit | Component two | New Term Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin (as a percent) | 2.50% |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit | First Lien Term Loan | Component one | First Lien Notes Due 2031 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, additional basis spread on variable rate (as a percent) |  | 1.75% |  |  |  |  |  |  |  |  |  |  |  |
Line of credit | First Lien Term Loan | Component one | New Term Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin (as a percent) |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |
Line of credit | Line of credit | New Term Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin (as a percent) | 0.50% | 0.50% |  |  |  |  |  |  |  |  |  |  |  |
Percentage of periodic payment (as a percent) | 1.00% | 1.00% |  |  |  |  |  |  |  |  |  |  |  |
Line of credit | Senior Secured Credit Facility | New Term Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin (as a percent) | 1.00% | 1.00% |  |  |  |  |  |  |  |  |  |  |  |
Line of credit | Senior Secured Credit Facility | Component one | New Term Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin (as a percent) | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit | Secured debt | Component two | New Term Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin (as a percent) | 0.00% | 0.00% |  |  |  |  |  |  |  |  |  |  |  |
Line of credit | Secured debt | SOFR | Component two | First Lien Notes Due 2031 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, additional basis spread on variable rate (as a percent) |  | 2.75% |  |  |  |  |  |  |  |  |  |  |  |

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