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Business Acquisition (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Feb. 10, 2017
Aug. 31, 2017
Aug. 31, 2017
Lennar Homebuilding | 4.125% senior notes due 2022      
Business Acquisition [Line Items]      
Interest rate   4.125% 4.125%
Senior Notes | Lennar Homebuilding | 4.125% senior notes due 2022      
Business Acquisition [Line Items]      
Interest rate   4.125% 4.125%
WCI Communities, Inc.      
Business Acquisition [Line Items]      
Amount paid to WCI stockholders $ 642.6    
Revenue since acquisition   $ 149.6 $ 351.9
Pre-tax earnings since acquisition   20.0 33.2
Transaction costs   $ 6.9 $ 25.9