Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended							6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2022	Apr. 30, 2022	Oct. 31, 2021	Apr. 30, 2021
Class of Stock [Line Items]
Stock Repurchase Program, Authorized Amount											$ 1,000.0
Treasury Stock, Shares, Acquired								5,800,000
Payments for Repurchase of Common Stock								$ 544.2
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 2.0						2.0
Divedends declared (in dollars per sh		$ 0.225	$ 0.225	$ 0.20	$ 0.20	$ 0.20	$ 0.20
Cash dividends paid per common share (in dollars per share)		$ 0.225	$ 0.225	$ 0.20	$ 0.20	$ 0.20	$ 0.20
Subsequent Event [Member]
Class of Stock [Line Items]
Stock Repurchase Program, Authorized Amount									$ 1,000.0
Divedends declared (in dollars per sh	$ 0.225
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
At-the-market Equity Offering Program, Common Stock Issued								84,547
Stock Issued During Period, Value, New Issues								$ 1.7
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs								0.1
Common Stock Available for Issuance, Value Remaining		$ 748.2						$ 748.2