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CAPITAL STOCK - Summary of Restricted Stock and Restricted Stock Unit Award Activity (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock unit awards that vested during the period		950,000	620,000	830,000
Fair value of vested restricted stock held by:		$ 15.9	$ 11.0	$ 16.9
Compensation expense recognized during the period		15.8	22.9	15.5
Income tax benefit recognized upon vesting of restricted stock awards held by:		2.8	1.1	5.6
Restricted Stock | CUSA Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of vested restricted stock held by:		15.3	9.7	16.5
Compensation expense recognized during the period		14.8	22.0	14.6
Income tax benefit recognized upon vesting of restricted stock awards held by:		2.7	0.8	5.5
Restricted Stock | Holdings Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of vested restricted stock held by:		0.6	1.3	0.4
Compensation expense recognized during the period		1.0	0.9	0.9
Income tax benefit recognized upon vesting of restricted stock awards held by:		$ 0.1	$ 0.3	$ 0.1
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock unit awards that vested during the period		100,000	230,000	210,000
Fair value of vested restricted stock held by:		$ 1.7	$ 4.1	$ 5.1
Accumulated dividends paid upon vesting of restricted stock unit awards		0.3	0.1	0.9
Compensation expense recognized during the period	[1]	5.7	6.4	3.9
Income tax benefit recognized upon vesting of restricted stock awards held by:			$ 0.7	$ 0.8
[1] The former CEO of Holdings retired on December 31, 2021 and all of his outstanding unvested restricted stock units vested upon his retirement in accordance with his employment agreement. Holdings recorded incremental compensation expense of $2.4 related to the accelerated vesting of these awards during the year ended December 31, 2021.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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