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Revenues (Tables)
 3 Months Ended
Dec. 31, 2018
Revenues [Abstract]  
Revenue from External Customers by Products and Services [Table Text Block]
Revenues consist of:
 
Three Months Ended December 31,
 
2018
 
2017
 
(In millions)
Residential real estate
$
32.5

 
$
23.4

Land and lot banking
2.2

 
—

Commercial real estate
3.5

 
7.2

Other
0.3

 
0.3

 
$
38.5

 
$
30.9