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Revenues Revenues (Notes)
6 Months Ended
Mar. 31, 2020
Revenues [Abstract]  
Revenue from Contract with Customer [Text Block] Revenues
Revenues consist of:
 Three Months Ended March 31,Six Months Ended March 31,
 2020201920202019
 (In millions)
Residential lot sales$156.4  $49.3  $373.5  $84.0  
Residential tract sales—  —  30.0  —  
Commercial tract sales2.5  15.0  2.5  18.5  
Other0.2  1.0  0.4  1.3  
$159.1  $65.3  $406.4  $103.8