Debt - Holding Company Debt (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2024	Jun. 13, 2024	May 31, 2024	Apr. 30, 2024	Feb. 29, 2024	Dec. 31, 2023
Debt Instrument
Debt	$ 6,625.0					$ 7,207.0
Revolving credit facility
Debt Instrument
Credit agreement	301.0
Letter of Credit
Debt Instrument
Credit agreement	24.0
Holding Company
Debt Instrument
Debt	4,860.0					4,847.0
Energy
Debt Instrument
Debt	1,584.0					2,185.0
Automotive Segment
Debt Instrument
Debt	27.0					33.0
Food Packaging Segment
Debt Instrument
Debt	139.0					133.0
Real Estate Segment
Debt Instrument
Debt	1.0					1.0
Home Fashion Segment
Debt Instrument
Debt	14.0					8.0
Reporting Segments
Debt Instrument
Debt	$ 1,765.0					2,360.0
6.375% senior unsecured notes due 2025 | Holding Company
Debt Instrument
Debt						$ 749.0
Interest rate on debt instrument (in percent)	6.375%	6.375%				6.375%
6.250% senior unsecured notes due 2026 | Holding Company
Debt Instrument
Debt	$ 1,250.0					$ 1,238.0
Interest rate on debt instrument (in percent)	6.25%			6.25%		6.25%
Debt face amount				$ 12.0
5.250% senior unsecured notes due 2027 | Holding Company
Debt Instrument
Debt	$ 1,457.0					$ 1,454.0
Interest rate on debt instrument (in percent)	5.25%			5.25%		5.25%
Debt face amount				$ 5.0
5.25% senior unsecured notes due 2025 | Energy
Debt Instrument
Interest rate on debt instrument (in percent)					5.25%
Debt face amount					$ 600.0
Loss on extinguishment of debt	$ (1.0)
4.375% senior unsecured notes due 2029 | Holding Company
Debt Instrument
Debt	$ 708.0					$ 708.0
Interest rate on debt instrument (in percent)	4.375%					4.375%
9.750% senior unsecured notes due 2029 | Holding Company
Debt Instrument
Debt	$ 698.0					$ 698.0
Interest rate on debt instrument (in percent)	9.75%					9.75%
9.000% senior unsecured notes due 2030 | Holding Company
Debt Instrument
Debt	$ 747.0
Interest rate on debt instrument (in percent)	9.00%		9.00%			9.00%
Debt face amount			$ 750.0