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Derivative Instruments and Hedging Activities (Tables)
 12 Months Ended
Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Notional Amounts Related to Open Derivative Contracts
The following table summarizes by derivative type the gross notional amounts related to open derivative contracts at September 30, 2018 and 2017 and the final settlement date of the Company's open derivative transactions as of September 30, 2018, excluding those derivatives that qualified for the NPNS exception:
 
 
 
 
 
 
Notional Amounts
(in millions)
Type
 
Units
 
Settlements Extending Through
 
2018
 
2017
Commodity Price Risk:
 
 
 
 
 
 
 
 
Regulated Utility Operations
 
 
 
 
 
 
 
 
Gas Utility NYMEX natural gas futures and option contracts
 
Dekatherms
 
September 2019
 
23.2

 
14.8

FTRs contracts
 
Kilowatt hours
 
N/A
 
—

 
101.2

Non-utility Operations
 
 
 
 
 
 
 
 
LPG swaps
 
Gallons
 
September 2020
 
394.3

 
325.5

Natural gas futures, forward and pipeline contracts
 
Dekatherms
 
October 2022
 
159.7

 
75.9

Natural gas basis swap contracts
 
Dekatherms
 
March 2023
 
54.4

 
104.2

NYMEX natural gas storage
 
Dekatherms
 
May 2019
 
1.8

 
1.9

NYMEX propane storage
 
Gallons
 
April 2019
 
0.6

 
0.3

Electricity long forward and futures contracts
 
Kilowatt hours
 
May 2022
 
4,307.6

 
4,440.3

Electricity short forward and futures contracts
 
Kilowatt hours
 
March 2022
 
359.3

 
447.0

Interest Rate Risk:
 
 
 
 
 
 
 
 
Interest rate swaps
 
Euro
 
October 2020
 
€
585.8

 
€
645.8

Interest rate swaps
 
USD
 
July 2022
 
$
114.1

 
$
—

Foreign Currency Exchange Rate Risk:
 
 
 
 
 
 
 
 
Forward foreign currency exchange contracts
 
USD
 
September 2021
 
$
512.2

 
$
424.8

Cross-currency swaps
 
USD
 
April 2020
 
$
49.9

 
$
59.1
Schedule of Derivative Assets, Liabilities and the Effects of Offsetting
The following table presents the Company’s derivative assets and liabilities by type, as well as the effects of offsetting, as of September 30, 2018 and 2017:
 
2018
 
2017
Derivative assets:
 
 
 
Derivatives designated as hedging instruments:
 
 
 
Foreign currency contracts
$
1.5

 
$
3.2

Cross-currency contracts
0.9

 
—

 
2.4

 
3.2

Derivatives subject to PGC and DS mechanisms:
 
 
 
Commodity contracts
3.0

 
1.7

Derivatives not designated as hedging instruments:
 
 
 
Commodity contracts
208.0

 
102.4

Foreign currency contracts
19.1

 
9.0

 
227.1

 
111.4

Total derivative assets – gross
232.5

 
116.3

Gross amounts offset in the balance sheet
(34.3
)
 
(35.7
)
Cash collateral received
(12.2
)
 
(8.3
)
Total derivative assets – net
$
186.0

 
$
72.3

 
 
 
 
Derivative liabilities:
 
 
 
Derivatives designated as hedging instruments:
 
 
 
Foreign currency contracts
$
(0.4
)
 
$
(5.5
)
Cross-currency contracts
—

 
(2.9
)
Interest rate contracts
(1.0
)
 
(2.3
)
 
(1.4
)
 
(10.7
)
Derivatives subject to PGC and DS mechanisms:
 
 
 
Commodity contracts
(0.1
)
 
(1.5
)
Derivatives not designated as hedging instruments:
 
 
 
Commodity contracts
(43.3
)
 
(37.6
)
Foreign currency contracts
(14.0
)
 
(32.7
)
 
(57.3
)
 
(70.3
)
Total derivative liabilities – gross
(58.8
)
 
(82.5
)
Gross amounts offset in the balance sheet
34.3

 
35.7

Total derivative liabilities – net
$
(24.5
)
 
$
(46.8
)
Effects of Derivative Instruments on Condensed Consolidated Statements of Income and Changes in AOCI and Noncontrolling Interest
The following tables provide information on the effects of derivative instruments on the Consolidated Statements of Income and changes in AOCI for Fiscal 2018, Fiscal 2017 and Fiscal 2016:
 
Gain (Loss)
Recognized in
AOCI
 
Gain (Loss)
Reclassified from
AOCI and Noncontrolling
Interests into Income
 
Location of Gain (Loss) Reclassified from
AOCI and Noncontrolling
Interests into Income
 
2018
 
2017
 
2016
 
2018
 
2017
 
2016
 
Cash Flow Hedges:
 
 
 
 
 
 
 
 
 
 
 
 
 
Foreign currency contracts
$
0.4

 
$
0.2

 
$
3.6

 
$
(3.0
)
 
$
17.8

 
$
17.2

 
Cost of sales
Cross-currency contracts
1.2

 
0.5

 
0.1

 
1.1

 
(0.1
)
 
0.4

 
Interest expense /other operating income, net
Interest rate contracts
0.2

 
1.5

 
(32.5
)
 
(5.0
)
 
(3.9
)
 
(4.5
)
 
Interest expense
Total
$
1.8

 
$
2.2

 
$
(28.8
)
 
$
(6.9
)
 
$
13.8

 
$
13.1

 
 

 
Gain (Loss)
Recognized in Income
Location of
Gain (Loss)
Recognized in Income
 
2018
 
2017
 
2016
Derivatives Not Designated as Hedging Instruments:
 
 
 
 
 
 
Commodity contracts
$
155.4

 
$
166.0

 
$
(65.0
)
Cost of sales
Commodity contracts
(5.3
)
 
(2.0
)
 
(2.2
)
Revenues
Commodity contracts
0.3

 
0.2

 
(0.1
)
Operating and administrative expenses / other operating income, net
Foreign currency contracts
16.2

 
(23.8
)
 
—

Gain (loss) on foreign currency contracts, net
Total
$
166.6

 
$
140.4

 
$
(67.3
)