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Revenues (Tables)
 3 Months Ended
Dec. 31, 2019
Revenues [Abstract]  
Revenue from External Customers by Products and Services [Table Text Block]
Revenues consist of:
 
Three Months Ended December 31,
 
2019
 
2018
 
(In millions)
Residential lot sales
$
217.1

 
$
34.7

Residential tract sales
30.0

 
—

Commercial tract sales
—

 
3.5

Other
0.1

 
0.3

 
$
247.2

 
$
38.5