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Revenues (Tables)
3 Months Ended
Dec. 31, 2020
Revenues [Abstract]  
Revenue from External Customers by Products and Services [Table Text Block]
Revenues consist of:
 Three Months Ended December 31,
 20202019
 (In millions)
Residential lot sales$307.0 $217.1 
Residential tract sales— 30.0 
Other0.1 0.1 
$307.1 $247.2