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PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS (Tables)
 9 Months Ended
Jun. 30, 2017
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,
 
2017
 
2016
 
2017
 
2016
Spire
 
 
 
 
 
 
 
Service cost – benefits earned during the period
$
5.0

 
$
3.8

 
$
15.5

 
$
11.5

Interest cost on projected benefit obligation
7.0

 
6.9

 
20.8

 
21.0

Expected return on plan assets
(9.4
)
 
(8.6
)
 
(29.0
)
 
(26.3
)
Amortization of prior service cost
0.2

 
0.1

 
0.7

 
0.3

Amortization of actuarial loss
3.0

 
1.9

 
9.6

 
5.9

Loss on lump-sum settlements
—

 
0.2

 
11.9

 
2.4

Special termination benefits
—

 
—

 
—

 
1.6

Subtotal
5.8

 
4.3

 
29.5

 
16.4

Regulatory adjustment
3.1

 
4.4

 
0.3

 
11.1

Net pension cost
$
8.9

 
$
8.7

 
$
29.8

 
$
27.5
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,
 
2017
 
2016
 
2017
 
2016
Spire
 
 
 
 
 
 
 
Service cost – benefits earned during the period
$
2.7

 
$
2.7

 
$
8.2

 
$
8.2

Interest cost on accumulated postretirement benefit obligation
2.2

 
2.6

 
6.5

 
7.6

Expected return on plan assets
(3.5
)
 
(3.3
)
 
(10.3
)
 
(10.1
)
Amortization of prior service credit
—

 
0.1

 
—

 
0.2

Amortization of actuarial loss
0.6

 
0.9

 
1.8

 
2.7

Special termination benefits
—

 
—

 
—

 
2.6

Subtotal
2.0

 
3.0

 
6.2

 
11.2

Regulatory adjustment
(0.8
)
 
(1.7
)
 
(2.4
)
 
(7.6
)
Net postretirement benefit cost
$
1.2

 
$
1.3

 
$
3.8

 
$
3.6
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
$
3.0

 
$
2.5

 
$
9.6

 
$
7.5

Interest cost on projected benefit obligation
4.8

 
5.4

 
14.5

 
16.2

Expected return on plan assets
(6.8
)
 
(6.7
)
 
(21.2
)
 
(20.1
)
Amortization of prior service cost
0.2

 
0.1

 
0.7

 
0.3

Amortization of actuarial loss
2.5

 
1.9

 
8.2

 
5.9

Loss on lump-sum settlements
—

 
—

 
11.5

 
—

Special termination benefits
—

 
—

 
—

 
1.6

Subtotal
3.7

 
3.2

 
23.3

 
11.4

Regulatory adjustment
1.3

 
3.0

 
(4.5
)
 
8.8

Net pension cost
$
5.0

 
$
6.2

 
$
18.8

 
$
20.2
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

 
$
2.6

 
$
7.8

 
$
7.9

Interest cost on accumulated postretirement benefit obligation
1.7

 
2.1

 
5.1

 
6.1

Expected return on plan assets
(2.3
)
 
(2.1
)
 
(6.8
)
 
(6.4
)
Amortization of prior service credit
0.1

 
0.1

 
0.2

 
0.2

Amortization of actuarial loss
0.6

 
1.0

 
1.9

 
2.9

Special termination benefits
—

 
—

 
—

 
2.6

Subtotal
2.7

 
3.7

 
8.2

 
13.3

Regulatory adjustment
(0.4
)
 
(1.2
)
 
(1.1
)
 
(6.2
)
Net postretirement benefit cost
$
2.3

 
$
2.5

 
$
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
$
1.6

 
$
1.3

 
$
4.7

 
$
4.0

Interest cost on projected benefit obligation
1.6

 
1.5

 
4.6

 
4.8

Expected return on plan assets
(1.8
)
 
(1.9
)
 
(5.4
)
 
(6.2
)
Amortization of actuarial loss
0.5

 
—

 
1.4

 
—

Loss on lump-sum settlements
—

 
0.2

 
0.4

 
2.4

Subtotal
1.9

 
1.1

 
5.7

 
5.0

Regulatory adjustment
1.6

 
1.4

 
4.3

 
2.3

Net pension cost
$
3.5

 
$
2.5

 
$
10.0

 
$
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

Interest cost on accumulated postretirement benefit obligation
0.4

 
0.5

 
1.2

 
1.5

Expected return on plan assets
(1.1
)
 
(1.2
)
 
(3.3
)
 
(3.7
)
Amortization of prior service credit
(0.1
)
 
—

 
(0.2
)
 
—

Amortization of actuarial gain
—

 
(0.1
)
 
(0.1
)
 
(0.2
)
Subtotal
(0.8
)
 
(0.7
)
 
(2.2
)
 
(2.1
)
Regulatory adjustment
(0.5
)
 
(0.5
)
 
(1.4
)
 
(1.4
)
Net postretirement benefit income
$
(1.3
)
 
$
(1.2
)
 
$
(3.6
)
 
$
(3.5
)