CAPITAL STOCK - Summary of Treasury Stock Activity (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Treasury Stock, Number of Shares and Restriction Disclosures [Abstract]
Treasury Stock Shares		6,000,000	5,680,000	5,350,000	5,050,000.00
Restricted stock withholdings	[1]	220,000	260,000	240,000
Restricted stock forfeitures	[2]	100,000	70,000.00	60,000.00
Beginning Balance, Cost		$ 95.4	$ 91.1	$ 87.0
Restricted stock withholdings	[1]	2.9	4.3	4.1
Restricted stock forfeitures	[2]	0.0	0.0	0.0
Ending Balance, Cost		$ 98.3	$ 95.4	$ 91.1

[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:

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