Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2023	Apr. 01, 2023	Oct. 31, 2021
Class of Stock [Line Items]
Stock Repurchase Program, Authorized Amount						$ 1,000.0
Treasury Stock, Shares, Acquired		3,100,000			7,700,000
Payments for Repurchase of Common Stock		$ 342.9			$ 764.2
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 657.1			657.1
Divedends declared (in dollars per sh		$ 0.25	$ 0.25	$ 0.25
Cash dividends paid per common share (in dollars per share)		$ 0.25	$ 0.25	$ 0.25
Subsequent Event [Member]
Class of Stock [Line Items]
Divedends declared (in dollars per sh	$ 0.25
Forestar Group [Member]
Class of Stock [Line Items]
Equity Securities Registered, Value							$ 750.0
At-the-market Equity Offering Program, Common Stock Available for Issuance		$ 298.2			298.2		$ 300.0
Common Stock Available for Issuance, Value Remaining		$ 748.2			$ 748.2
At-the-market Equity Offering Program, Common Stock Issued					0