Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended					6 Months Ended
	Oct. 30, 2023	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2024	Oct. 31, 2023	Oct. 31, 2021
Class of Stock [Line Items]
Stock Repurchase Program, Authorized Amount								$ 1,500.0
Treasury Stock, Shares, Acquired							6,100,000
Payments for Repurchase of Common Stock	$ 201.6						$ 800.5
Stock Repurchase Program, Remaining Authorized Repurchase Amount			$ 901.1				901.1
Cash dividends paid per common share (in dollars per share)			$ 0.30	$ 0.30
Divedends declared (in dollars per sh			$ 0.30	$ 0.30
Cash dividends declared			$ (99.2)	$ (99.9)	$ (85.6)	$ (86.1)
Retained Earnings [Member]
Class of Stock [Line Items]
Cash dividends declared			(99.2)	$ (99.9)	$ (85.6)	$ (86.1)	(199.1)
Subsequent Event [Member]
Class of Stock [Line Items]
Divedends declared (in dollars per sh		$ 0.30
Forestar Group [Member]
Class of Stock [Line Items]
Equity Securities Registered, Value			750.0				750.0
At-the-market Equity Offering Program, Common Stock Available for Issuance			$ 278.1				278.1		$ 300.0
At-the-market Equity Offering Program, Common Stock Issued			546,174
Stock Issued During Period, Value, New Issues			$ 19.7
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs			0.4
Common Stock Available for Issuance, Value Remaining			$ 728.1				$ 728.1