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Statement of Financial Position, Classified (Tables)
 6 Months Ended
Mar. 31, 2020
Statement of Financial Position [Abstract]  
Real Estate
Real estate consists of:
March 31,
2020		September 30,
2019
 (In millions)
Developed and under development projects$1,171.0  $1,011.8  
Undeveloped land28.2  17.1  
$1,199.2  $1,028.9