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PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS (Tables)
 3 Months Ended
Dec. 31, 2015
Pension Plans  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Net Periodic Cost
The net periodic pension cost included the following components:
 
Three Months Ended December 31,
 
2015
 
2014
Laclede Group
 
 
 
Service cost – benefits earned during the period
$
3.9

 
$
4.3

Interest cost on projected benefit obligation
7.1

 
7.5

Expected return on plan assets
(8.9
)
 
(9.4
)
Amortization of prior service cost
0.1

 
0.1

Amortization of actuarial loss
2.0

 
1.9

Special termination benefit
1.6

 
—

Subtotal
5.8

 
4.4

Regulatory adjustment
5.0

 
4.9

Net pension cost
$
10.8

 
$
9.3
Postretirement Plans  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Net Periodic Cost
Net periodic postretirement benefit cost for the Company consisted of the following components:
 
Three Months Ended December 31,
 
2015
 
2014
Laclede Group
 
 
 
Service cost – benefits earned during the period
$
2.8

 
$
3.2

Interest cost on accumulated postretirement benefit obligation
2.5

 
2.8

Expected return on plan assets
(3.4
)
 
(3.3
)
Amortization of prior service credit
0.1

 
0.2

Amortization of actuarial loss
0.9

 
1.3

Special termination benefit
2.6

 
—

Subtotal
5.5

 
4.2

Regulatory adjustment
(4.2
)
 
(2.7
)
Net postretirement benefit cost
$
1.3

 
$
1.5
Laclede Gas | Pension Plans  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Net Periodic Cost
Laclede Gas
 
 
 
Service cost – benefits earned during the period
$
2.5

 
$
2.8

Interest cost on projected benefit obligation
5.4

 
5.9

Expected return on plan assets
(6.7
)
 
(7.3
)
Amortization of prior service cost
0.1

 
0.1

Amortization of actuarial loss
2.0

 
1.9

Special termination benefit
1.6

 
—

Subtotal
4.9

 
3.4

Regulatory adjustment
3.5

 
3.4

Net pension cost
$
8.4

 
$
6.8
Laclede Gas | Postretirement Plans  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Net Periodic Cost
Laclede Gas
 
 
 
Service cost – benefits earned during the period
$
2.7

 
$
3.1

Interest cost on accumulated postretirement benefit obligation
2.0

 
2.1

Expected return on plan assets
(2.1
)
 
(2.0
)
Amortization of prior service credit
0.1

 
0.2

Amortization of actuarial loss
1.0

 
1.3

Special termination benefit
2.6

 
—

Subtotal
6.3

 
4.7

Regulatory adjustment
(3.8
)
 
(2.3
)
Net postretirement benefit cost
$
2.5

 
$
2.4
Alagasco | Pension Plans  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Net Periodic Cost
Alagasco
 
 
 
Service cost – benefits earned during the period
$
1.4

 
$
1.5

Interest cost on projected benefit obligation
1.7

 
1.6

Expected return on plan assets
(2.2
)
 
(2.1
)
Subtotal
0.9

 
1.0

Regulatory adjustment
1.5

 
1.5

Net pension cost
$
2.4

 
$
2.5
Alagasco | Postretirement Plans  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Net Periodic Cost
Alagasco
 
 
 
Service cost – benefits earned during the period
$
0.1

 
$
0.1

Interest cost on accumulated postretirement benefit obligation
0.5

 
0.7

Expected return on plan assets
(1.3
)
 
(1.3
)
Amortization of actuarial gain
(0.1
)
 
—

Subtotal
(0.8
)
 
(0.5
)
Regulatory adjustment
(0.4
)
 
(0.4
)
Net postretirement benefit income
$
(1.2
)
 
$
(0.9
)