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PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS (Tables)
 9 Months Ended
Jun. 30, 2016
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 June 30,
 
Nine Months Ended June 30,
 
2016
 
2015
 
2016
 
2015
Spire
 
 
 
 
 
 
 
Service cost – benefits earned during the period
$
3.8

 
$
4.4

 
$
11.5

 
$
13.0

Interest cost on projected benefit obligation
6.9

 
7.4

 
21.0

 
22.3

Expected return on plan assets
(8.6
)
 
(9.4
)
 
(26.3
)
 
(28.1
)
Amortization of prior service cost
0.1

 
0.1

 
0.3

 
0.3

Amortization of actuarial loss
1.9

 
1.8

 
5.9

 
5.7

Loss on lump-sum settlements
0.2

 
12.5

 
2.4

 
12.5

Special termination benefits
—

 
—

 
1.6

 
—

Subtotal
4.3

 
16.8

 
16.4

 
25.7

Regulatory adjustment
4.4

 
(6.3
)
 
11.1

 
3.4

Net pension cost
$
8.7

 
$
10.5

 
$
27.5

 
$
29.1
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 June 30,
 
Nine Months Ended June 30,
 
2016
 
2015
 
2016
 
2015
Spire
 
 
 
 
 
 
 
Service cost – benefits earned during the period
$
2.7

 
$
3.2

 
$
8.2

 
$
9.6

Interest cost on accumulated postretirement benefit obligation
2.6

 
2.8

 
7.6

 
8.4

Expected return on plan assets
(3.3
)
 
(3.3
)
 
(10.1
)
 
(9.9
)
Amortization of prior service credit
0.1

 
0.2

 
0.2

 
0.6

Amortization of actuarial loss
0.9

 
1.3

 
2.7

 
3.8

Special termination benefits
—

 
—

 
2.6

 
—

Subtotal
3.0

 
4.2

 
11.2

 
12.5

Regulatory adjustment
(1.7
)
 
(2.8
)
 
(7.6
)
 
(8.2
)
Net postretirement benefit cost
$
1.3

 
$
1.4

 
$
3.6

 
$
4.3
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

 
$
2.9

 
$
7.5

 
$
8.6

Interest cost on projected benefit obligation
5.4

 
5.8

 
16.2

 
17.6

Expected return on plan assets
(6.7
)
 
(7.3
)
 
(20.1
)
 
(21.9
)
Amortization of prior service cost
0.1

 
0.1

 
0.3

 
0.3

Amortization of actuarial loss
1.9

 
1.8

 
5.9

 
5.7

Loss on lump-sum settlements
—

 
12.5

 
—

 
12.5

Special termination benefits
—

 
—

 
1.6

 
—

Subtotal
3.2

 
15.8

 
11.4

 
22.8

Regulatory adjustment
3.0

 
(7.8
)
 
8.8

 
(1.0
)
Net pension cost
$
6.2

 
$
8.0

 
$
20.2

 
$
21.8
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
$
2.6

 
$
3.0

 
$
7.9

 
$
9.2

Interest cost on accumulated postretirement benefit obligation
2.1

 
2.2

 
6.1

 
6.5

Expected return on plan assets
(2.1
)
 
(2.0
)
 
(6.4
)
 
(6.1
)
Amortization of prior service credit
0.1

 
0.2

 
0.2

 
0.6

Amortization of actuarial loss
1.0

 
1.3

 
2.9

 
3.8

Special termination benefits
—

 
—

 
2.6

 
—

Subtotal
3.7

 
4.7

 
13.3

 
14.0

Regulatory adjustment
(1.2
)
 
(2.3
)
 
(6.2
)
 
(6.9
)
Net postretirement benefit cost
$
2.5

 
$
2.4

 
$
7.1

 
$
7.1
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
$
1.3

 
$
1.5

 
$
4.0

 
$
4.4

Interest cost on projected benefit obligation
1.5

 
1.6

 
4.8

 
4.7

Expected return on plan assets
(1.9
)
 
(2.1
)
 
(6.2
)
 
(6.2
)
Loss on lump-sum settlements
0.2

 
—

 
2.4

 
—

Subtotal
1.1

 
1.0

 
5.0

 
2.9

Regulatory adjustment
1.4

 
1.5

 
2.3

 
4.4

Net pension cost
$
2.5

 
$
2.5

 
$
7.3

 
$
7.3
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

 
$
0.2

 
$
0.3

 
$
0.4

Interest cost on accumulated postretirement benefit obligation
0.5

 
0.6

 
1.5

 
1.9

Expected return on plan assets
(1.2
)
 
(1.3
)
 
(3.7
)
 
(3.8
)
Amortization of prior service credit
—

 
—

 
—

 
—

Amortization of actuarial gain
(0.1
)
 
—

 
(0.2
)
 
—

Subtotal
(0.7
)
 
(0.5
)
 
(2.1
)
 
(1.5
)
Regulatory adjustment
(0.5
)
 
(0.5
)
 
(1.4
)
 
(1.3
)
Net postretirement benefit income
$
(1.2
)
 
$
(1.0
)
 
$
(3.5
)
 
$
(2.8
)