Investments In Unconsolidated Entities (Narrative) (Details) $ in Millions	12 Months Ended
	Nov. 30, 2021 USD ($) property	Dec. 01, 2021 USD ($)	Nov. 30, 2020 USD ($)
Upward America Venture
Schedule of Equity Method Investments [Line Items]
Equity Method Investment , Total Equity Commitments	$ 125.0
Number of Homes Delivered \| property	1,457
Homebuilding
Schedule of Equity Method Investments [Line Items]
Debt	$ 1,200.0		$ 1,100.0
Maximum recourse exposure	5.3		4.9
Unconsolidated entities non-recourse debt with completion guarantees	241.0		183.3
Multifamily
Schedule of Equity Method Investments [Line Items]
Unconsolidated entities non-recourse debt with completion guarantees	855.2		$ 722.9
Upward America Venture
Schedule of Equity Method Investments [Line Items]
Equity Method Investment , Total Equity Commitments	$ 1,250.0
Upward America Venture \| Subsequent Event
Schedule of Equity Method Investments [Line Items]
Equity Method Investment , Total Equity Commitments		$ 1,600.0