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Revenues (Tables)
6 Months Ended
Mar. 31, 2021
Revenues [Abstract]  
Revenue from External Customers by Products and Services [Table Text Block]
Revenues consist of:
 Three Months Ended March 31,Six Months Ended March 31,
 2021202020212020
 (In millions)
Residential lot sales$280.2 $156.4 $587.1 $373.5 
Tract sales and other6.9 2.7 7.1 32.9 
$287.1 $159.1 $594.2 $406.4