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FAIR VALUE MEASUREMENTS (Tables)
 9 Months Ended
Jun. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair Value Measurements, Measured on Recurring Basis
The information presented below categorizes the assets and liabilities in the balance sheets that are accounted for at fair value on a recurring basis in periods subsequent to initial recognition.
The mutual funds included in Level 1 are valued based on exchange-quoted market prices of individual securities. The mutual funds included in Level 2 are valued based on the closing net asset value per unit.
Derivative instruments included in Level 1 are valued using quoted market prices on the New York Mercantile Exchange (NYMEX) or the Intercontinental Exchange (ICE). Derivative instruments classified in Level 2 include physical commodity derivatives that are valued using Over-the-Counter Bulletin Board (OTCBB), broker, or dealer quotation services whose prices are derived principally from, or are corroborated by, observable market inputs. Also included in Level 2 are certain derivative instruments that have values that are similar to, and correlate with, quoted prices for exchange-traded instruments in active markets and derivative instruments with settlement dates more than one year into the future. Derivative instruments included in Level 3 are valued using generally unobservable inputs that are based upon the best information available and reflect management’s assumptions about how market participants would price the asset or liability. The Level 3 balances as of June 30, 2017, September 30, 2016 and June 30, 2016 consisted of gas commodity contracts. The Company’s and the Utilities’ policy is to recognize transfers between the levels of the fair value hierarchy, if any, as of the beginning of the interim reporting period in which circumstances change or events occur to cause the transfer.
The mutual funds are included in “Other Investments” on the Company’s balance sheets and in “Other Property and Investments” on Laclede Gas’ balance sheets. Derivative assets and liabilities, including receivables and payables associated with cash margin requirements, are presented net in the balance sheets when a legally enforceable netting agreement exists between the Company, Laclede Gas, or Alagasco and the counterparty to a derivative contract.
Spire
 
Quoted
Prices in
Active
Markets
(Level 1)
 
Significant
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
 
Effects of Netting and Cash Margin Receivables
/Payables
 
Total
As of June 30, 2017
 
 
 
 
 
 
 
 
 
ASSETS
 
 
 
 
 
 
 
 
 
Gas Utility
 
 
 
 
 
 
 
 
 
US stock/bond mutual funds
$
18.0

 
$
4.1

 
$
—

 
$
—

 
$
22.1

NYMEX/ICE natural gas contracts
1.9

 
—

 
—

 
(1.3
)
 
0.6

Gasoline and heating oil contracts
0.1

 
—

 
—

 
—

 
0.1

Subtotal
20.0

 
4.1

 
—

 
(1.3
)
 
22.8

Gas Marketing
 
 
 
 
 
 
 
 
 
NYMEX/ICE natural gas contracts
1.5

 
3.2

 
—

 
(2.6
)
 
2.1

Natural gas commodity contracts
—

 
6.1

 
0.6

 
(1.7
)
 
5.0

Total
$
21.5

 
$
13.4

 
$
0.6

 
$
(5.6
)
 
$
29.9

LIABILITIES
 
 
 
 
 
 
 
 
 
Gas Utility
 
 
 
 
 
 
 
 
 
NYMEX/ICE natural gas contracts
$
1.3

 
$
—

 
$
—

 
$
(1.3
)
 
$
—

Gas Marketing
 
 
 
 
 
 
 
 
 
NYMEX/ICE natural gas contracts
0.8

 
1.8

 
—

 
(2.6
)
 
—

Natural gas commodity contracts
—

 
6.7

 
—

 
(1.7
)
 
5.0

Other
 
 
 
 
 
 
 
 
 
Interest rate swaps
—

 
(0.6
)
 
—

 
—

 
(0.6
)
Total
$
2.1

 
$
7.9

 
$
—

 
$
(5.6
)
 
$
4.4


 
Quoted
Prices in
Active
Markets
(Level 1)
 
Significant
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
 
Effects of Netting and Cash Margin Receivables
/Payables
 
Total
As of September 30, 2016
 
 
 
 
 
 
 
 
 
ASSETS
 
 
 
 
 
 
 
 
 
Gas Utility
 
 
 
 
 
 
 
 
 
US stock/bond mutual funds
$
16.8

 
$
4.1

 
$
—

 
$
—

 
$
20.9

NYMEX/ICE natural gas contracts
5.3

 
—

 
—

 
(0.4
)
 
4.9

NYMEX gasoline and heating oil contracts
0.4

 
—

 
—

 
(0.3
)
 
0.1

Subtotal
22.5

 
4.1

 
—

 
(0.7
)
 
25.9

Gas Marketing
 
 
 
 
 
 
 
 
 
NYMEX/ICE natural gas contracts
0.4

 
3.4

 
—

 
(3.4
)
 
0.4

Natural gas commodity contracts
—

 
8.7

 
0.2

 
(0.9
)
 
8.0

Total
$
22.9

 
$
16.2

 
$
0.2

 
$
(5.0
)
 
$
34.3

LIABILITIES
 
 
 
 
 
 
 
 
 
Gas Utility
 
 
 
 
 
 
 
 
 
NYMEX/ICE natural gas contracts
$
1.6

 
$
—

 
$
—

 
$
(1.6
)
 
$
—

OTCBB natural gas contracts
—

 
0.2

 
—

 
—

 
0.2

Subtotal
1.6

 
0.2

 
—

 
(1.6
)
 
0.2

Gas Marketing
 
 
 
 
 
 
 
 
 
NYMEX/ICE natural gas contracts
3.5

 
1.6

 
—

 
(5.1
)
 
—

Natural gas commodity contracts
—

 
2.6

 
—

 
(0.9
)
 
1.7

Other
 
 
 
 
 
 
 
 
 
Interest rate swaps
—

 
3.0

 
—

 
—

 
3.0

Total
$
5.1

 
$
7.4

 
$
—

 
$
(7.6
)
 
$
4.9

 
 
 
 
 
 
 
 
 
 
As of June 30, 2016
 
 
 
 
 
 
 
 
 
ASSETS
 
 
 
 
 
 
 
 
 
Gas Utility
 
 
 
 
 
 
 
 
 
US stock/bond mutual funds
$
16.4

 
$
4.0

 
$
—

 
$
—

 
$
20.4

NYMEX/ICE natural gas contracts
8.2

 
—

 
—

 
(3.1
)
 
5.1

Subtotal
24.6

 
4.0

 
—

 
(3.1
)
 
25.5

Gas Marketing
 
 
 
 
 
 
 
 
 
NYMEX/ICE natural gas contracts
0.6

 
5.5

 
—

 
(5.6
)
 
0.5

Natural gas commodity contracts
—

 
6.3

 
0.3

 
(0.6
)
 
6.0

Total
$
25.2

 
$
15.8

 
$
0.3

 
$
(9.3
)
 
$
32.0

LIABILITIES
 
 
 
 
 
 
 
 
 
Gas Utility
 
 
 
 
 
 
 
 
 
OTCBB natural gas contracts
$
—

 
$
0.6

 
$
—

 
$
—

 
$
0.6

Subtotal
—

 
0.6

 
—

 
—

 
0.6

Gas Marketing
 
 
 
 
 
 
 
 
 
NYMEX/ICE natural gas contracts
6.5

 
2.5

 
—

 
(9.0
)
 
—

Natural gas commodity contracts
—

 
3.4

 
—

 
(0.5
)
 
2.9

Other
 
 
 
 
 
 
 
 
 
Interest Rate Swaps
—

 
4.0

 
—

 
—

 
4.0

Total
$
6.5

 
$
10.5

 
$
—

 
$
(9.5
)
 
$
7.5
Laclede Gas  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair Value Measurements, Measured on Recurring Basis
 
Quoted
Prices in
Active
Markets
(Level 1)
 
Significant
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
 
Effects of Netting and Cash Margin Receivables
/Payables
 
Total
As of June 30, 2017
 
 
 
 
 
 
 
 
 
ASSETS
 
 
 
 
 
 
 
 
 
US stock/bond mutual funds
$
18.0

 
$
4.1

 
$
—

 
$
—

 
$
22.1

NYMEX/ICE natural gas contracts
1.9

 
—

 
—

 
(1.3
)
 
0.6

NYMEX gasoline and heating oil contracts
0.1

 
—

 
—

 
—

 
0.1

Total
$
20.0

 
$
4.1

 
$
—

 
$
(1.3
)
 
$
22.8

LIABILITIES
 
 
 
 
 
 
 
 
 
NYMEX/ICE natural gas contracts
$
1.3

 
$
—

 
$
—

 
$
(1.3
)
 
$
—

Total
$
1.3

 
$
—

 
$
—

 
$
(1.3
)
 
$
—

As of September 30, 2016
 
 
 
 
 
 
 
 
 
ASSETS
 
 
 
 
 
 
 
 
 
US stock/bond mutual funds
$
16.8

 
$
4.1

 
$
—

 
$
—

 
$
20.9

NYMEX/ICE natural gas contracts
5.3

 
—

 
—

 
(0.4
)
 
4.9

NYMEX gasoline and heating oil contracts
0.3

 
—

 
—

 
(0.3
)
 
—

Total
$
22.4

 
$
4.1

 
$
—

 
$
(0.7
)
 
$
25.8

LIABILITIES
 
 
 
 
 
 
 
 
 
NYMEX/ICE natural gas contracts
$
1.6

 
$
—

 
$
—

 
$
(1.6
)
 
$
—

OTCBB natural gas contracts
—

 
0.2

 
—

 
—

 
0.2

Total
$
1.6

 
$
0.2

 
$
—

 
$
(1.6
)
 
$
0.2

As of June 30, 2016
 
 
 
 
 
 
 
 
 
ASSETS
 
 
 
 
 
 
 
 
 
US stock/bond mutual funds
$
16.4

 
$
4.0

 
$
—

 
$
—

 
$
20.4

NYMEX/ICE natural gas contracts
8.2

 
—

 
—

 
(3.1
)
 
5.1

Total
$
24.6

 
$
4.0

 
$
—

 
$
(3.1
)
 
$
25.5

LIABILITIES
 
 
 
 
 
 
 
 
 
OTCBB natural gas contracts
$
—

 
$
0.6

 
$
—

 
$
—

 
$
0.6

Total
$
—

 
$
0.6

 
$
—

 
$
—

 
$
0.6