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Face (par) amount of debt instrument at time of issuance.

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Long Term Debt - Additional Information (Detail) $ / shares in Units, $ in Millions					1 Months Ended		3 Months Ended		9 Months Ended							12 Months Ended
	Sep. 19, 2024 USD ($)	Jul. 18, 2024 USD ($)	May 28, 2024 USD ($)	May 01, 2024 USD ($)	Feb. 29, 2024 USD ($)	Jan. 31, 2024 USD ($)	Sep. 30, 2024 USD ($) $ / shares	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) $ / shares	Sep. 30, 2024 USD ($) $ / shares	Sep. 30, 2024 USD ($) $ / shares	Sep. 30, 2024 USD ($) d $ / shares	Sep. 30, 2024 USD ($) $ / shares	Sep. 30, 2024 USD ($) Tradingday $ / shares	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($) $ / shares	Jul. 09, 2024
Debt Instrument [Line Items]
Loss on debt amendments and extinguishments							$ 3.0	$ 0.0		$ 5.5					$ 10.7
Accumulated gain on swaps amortized to interest expense																$ 7.0
Interest Rate Swap Agreements Three [Member]
Debt Instrument [Line Items]
Derivative notional amount					$ 137.5	$ 137.5
Maturity date					Dec. 31, 2026	Dec. 31, 2027
5.875% Senior Notes
Debt Instrument [Line Items]
Interest rate		5.875%															5.875%
Aggregate principal amount outstanding	$ 59.7	$ 59.7
Debt Instrument Redemption Price Percentage Of Principal Amount Redeemed	100.00%
Senior Notes bond offering date		Jul. 09, 2024
Debt instrument, interest rate, stated percentage		5.875%															5.875%
Tender offer amount		$ 345.3
4.50 % Convertible Senior Notes
Debt Instrument [Line Items]
Interest rate							4.50%		4.50%	4.50%	4.50%	4.50%	4.50%	4.50%
Debt instrument, convertible, threshold trading days												30		20
Debt instrument, convertible, threshold consecutive trading days \| Tradingday														30
Conversion price per share, percentage													130.00%
Initial conversion price \| $ / shares							$ 14.35		$ 14.35	$ 14.35	$ 14.35	$ 14.35	$ 14.35	$ 14.35		$ 14.35
Senior note convertible debt							May 15, 2025		May 15, 2025	May 15, 2025	May 15, 2025	May 15, 2025	May 15, 2025	May 15, 2025
Debt instrument, interest rate, stated percentage							4.50%		4.50%	4.50%	4.50%	4.50%	4.50%	4.50%
7.00% Senior Notes
Debt Instrument [Line Items]
Amount outstanding under the term loan		$ 500.0
Interest rate		7.00%
Debt instrument, maturity date		Aug. 01, 2032
Debt issuance costs		$ 8.7
Debt Instrument Redemption Price Percentage Of Principal Amount Redeemed													107.00%
Debt instrument, redemption price, percentage													100.00%
Debt instrument, interest rate, stated percentage		7.00%
Premium to repurchase upon change in control													101.00%
CUSA [Member]
Debt Instrument [Line Items]
Average interest rate on outstanding borrowings							6.90%		6.90%	6.90%	6.90%	6.90%	6.90%	6.90%
Loss on debt amendments and extinguishments							$ 3.0	$ 0.0		$ 5.5					$ 10.7
Interest rate				8.75%
Debt issuance costs							28.5		$ 28.5	28.5	$ 28.5	$ 28.5	$ 28.5	$ 28.5		$ 27.5
Debt instrument, interest rate, stated percentage				8.75%
CUSA [Member] \| 5.875% Senior Notes
Debt Instrument [Line Items]
Amount that is outstanding after tender		$ 405.0
CUSA [Member] \| 8.75 % Senior Notes
Debt Instrument [Line Items]
Amount that is outstanding after tender				$ 150.0
Debt instrument, Accrued interest				156.6
Loss on debt amendments and extinguishments				$ 1.0
Interest rate				8.75%
Debt instrument, interest rate, stated percentage				8.75%
Minimum [Member] \| 4.50 % Convertible Senior Notes
Debt Instrument [Line Items]
Debt instrument, convertible, threshold trading days \| d												20
Sale price per share \| $ / shares											$ 18.66
Maximum [Member] \| 7.00% Senior Notes
Debt Instrument [Line Items]
Redeemable principal outstanding, percentage													40.00%
Term Loan Credit facility \| Senior Secured Credit Facility
Debt Instrument [Line Items]
Reduction in Interest Rate			0.50%
Reset Soft Call Intrest Rate			101.00%
Term Loan Credit facility \| CUSA [Member] \| Senior Secured Credit Facility
Debt Instrument [Line Items]
Quarterly principal payments due										1.6
Debt issuance costs			$ 1.0
Capitalized debt issuance costs			0.8
Legal and other fees			0.2
Write off amount of unamortized debt issuance costs and original issue discount			$ 1.3
Last quarterly payment date									Mar. 31, 2030
Final principal payment due date									May 24, 2030
Revolving Credit Line \| Amended Senior Secured Credit Facility [Member]
Debt Instrument [Line Items]
Amount outstanding under the term loan							640.3		$ 640.3	640.3	$ 640.3	$ 640.3	$ 640.3	640.3
Amount outstanding under the revolving credit line							$ 0.0		$ 0.0	$ 0.0	$ 0.0	$ 0.0	$ 0.0	$ 0.0