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Summary of Treasury Stock Activity (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Treasury Stock, Shares [Abstract]      
Beginning Balance, Shares 5,350,000 5,050,000.00 4,710,000
Restricted stock withholdings [1] 260,000 240,000 270,000
Restricted stock forfeitures [2] 70,000.00 60,000.00 70,000.00
Ending Balance, Shares 5,680,000 5,350,000 5,050,000.00
Beginning Balance, Cost $ 91.1 $ 87.0 $ 81.6
Restricted stock withholdings [1] 4.3 4.1 5.4
Restricted stock forfeitures 0.0 [1] 0.0 [2] 0.0 [2]
Ending Balance, Cost $ 95.4 $ 91.1 $ 87.0
[1] Holdings withheld shares as a result of the election by certain employees to satisfy their tax liabilities upon vesting in restricted stock and restricted stock units. Holdings determined the number of shares to be withheld based upon market values of the common stock of Holdings on the vest dates. Below is a summary of the range of market values per share on the vest dates for the years indicated:

 

 

Year Ended December 31,

 

 

2020

 

2021

 

2022

Market Values

 

$8.03 to $32.12

 

$15.21 to $24.14

 

$12.11 to $18.33
[2] Holdings repurchased forfeited restricted shares at a cost of $0.001 per share in accordance with the 2017 Omnibus Plan.