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Treasury Stock and Share-Based Awards - Summary of Treasury Stock Activity (Detail)
shares in Thousands, $ in Millions
 9 Months Ended
Sep. 30, 2025
USD ($)
shares
Treasury Stock, Number of Shares and Restriction Disclosures [Abstract]  
Number of Treasury Shares | shares 6,380
Repurchases of common stock, Share | shares 7,930 [1]
Receipt of shares related to maturity of hedge transactions | shares 16,230 [2]
Adjustment to excise tax accrual related to repurchases of common stock | shares 0 [1]
Restricted stock withholdings | shares 610 [3]
Restricted stock forfeitures | shares 60 [4]
Number of Treasury Shares | shares 31,210
Beginning Balance, Cost | $ $ 103.2
Repurchases of common stock | $ 201.6 [1]
Receipt of shares related to maturity of hedge transactions | $ 142.1 [2]
Adjustment to excise tax accrual pursuant to issuance of shares for settlement of warrant transactions | $ (0.4) [1]
Restricted stock withholdings | $ 17.6 [3]
Restricted stock forfeitures | $ 0.0 [4]
Ending Balance, Cost | $ $ 464.1
[1] Holdings repurchased outstanding common shares under a share repurchase program
[2] Holdings received common shares upon maturity of hedges. See Note 5 and Note 7 for further information on the hedge transactions.
[3] Holdings withheld shares as a result of the election by certain employees to satisfy their tax liabilities upon vesting of restricted stock and performance stock units with shares. Holdings determined the number of shares to be withheld based upon market values of Holdings’ common stock on the vesting dates, which ranged from $24.38 to $33.06 per share.
[4] Holdings repurchased forfeited restricted shares at a cost of $0.001 per share in accordance with its Long-Term Incentive Plan.