Stockholders' Equity (Detail) $ / shares in Units, $ in Millions	2 Months Ended	3 Months Ended	6 Months Ended	11 Months Ended	12 Months Ended
	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2024 USD ($) $ / shares shares	Jun. 30, 2024 USD ($) shares	Nov. 15, 2023 USD ($)	Dec. 31, 2024 USD ($) $ / shares shares	Dec. 31, 2022 USD ($)	Sep. 25, 2024 $ / shares shares	Sep. 24, 2024 $ / shares shares	Jul. 09, 2020 $ / shares
Class of Stock [Line Items]
Preferred shares, issued (in shares) | shares	6,000	6,000			6,000
Preferred shares, outstanding (in shares) | shares		6,000			6,000
Depositary shares issued (in shares) | shares		6,000,000			6,000,000
Fractional interest per preference share		0.001			0.001
Preferred stock, liquidation preference (in dollars per share)	$ 25,000	$ 25,000			$ 25,000
Depositary share, liquidation preference (in dollars per share)		$ 25			$ 25				$ 25
Preferred stock, dividend rate (in percentage)					7.00%
Preferred stock dividends (in dollars per share)					$ 1,750
Preferred stock, per depositary share amounts of preferred dividends (in dollars per share)					$ 1.75
Preferred stock, dividend payment rate, Basis spread on variable rate (in percentage)					0.06712
Dividends on Series A Preferred stock | $	$ 0.0			$ 10.5	$ 10.5	$ 10.5
Preferred shares, authorized (in shares) | shares	30,000,000	10,000			10,000		10,000	30,000,000
Preferred shares, par value (in dollars per share)	$ 1.00	$ 1.00			$ 1.00
Shares issued during the period (in shares) | shares			200,000,000
Shares issued during the period, value | $					$ 500.0
Common shares, shares authorized (in shares) | shares	2,000,000,000	1,000			1,000		1,000	2,000,000,000
Common shares, par value (in dollars per share)	$ 1.00	$ 0.01			$ 0.01		$ 0.01	$ 1.00
Common shares, shares issued (in shares) | shares	1,056,638,730	13			13		13
Private Loans | Related Party
Class of Stock [Line Items]
Non-cash transaction, private loans | $		$ 300.0			$ 300.0
Common Stock
Class of Stock [Line Items]
Shares issued during the period, value | $			$ 200.0		$ 200.0
Preferred Stock and Additional Paid-in Capital
Class of Stock [Line Items]
Preferred stock, liquidation preference (in dollars per share)									$ 25,000
Preferred stock dividends (in dollars per share)					$ 1,750