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COMMITMENTS AND CONTINGENCIES (Tables)
 12 Months Ended
Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]  
Aggregate Rental Expense and Annual Minimum Rental Commitments
Aggregate rental expense and annual minimum rental commitments under all leases having an initial or remaining non-cancelable term of more than one year are shown below:
 
Aggregate Rental Expense
 
 
Minimum Rental Commitments
 
2017
 
2016
 
2015
 
2018
 
2019
 
2020
 
2021
 
2022
 
Later
 
Total
Spire
$
9.7

 
$
11.9

 
$
14.1

 
$
10.1

 
$
9.3

 
$
7.8

 
$
6.1

 
$
6.0

 
$
44.4

 
$
83.7

Spire Missouri
4.8

 
4.3

 
7.6

 
2.1

 
1.3

 
0.2

 
0.2

 
—

 
—

 
3.8

Spire Alabama
4.6

 
3.7

 
4.0

 
4.0

 
4.1

 
3.8

 
2.1

 
2.1

 
2.8

 
18.9