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Derivative Instruments and Hedging Activities (Tables)
 6 Months Ended
Mar. 31, 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 as of March 31, 2018, September 30, 2017 and March 31, 2017, and the final settlement date of the Company's open derivative transactions as of March 31, 2018, excluding those derivatives that qualified for the NPNS exception:
 
 
 
 
 
 
Notional Amounts
(in millions)
Type
 
Units
 
Settlements Extending Through
 
March 31, 2018
 
September 30, 2017
 
March 31, 2017
Commodity Price Risk:
 
 
 
 
 
 
 
 
 
 
Regulated Utility Operations
 
 
 
 
 
 
 
 
 
 
Gas Utility NYMEX natural gas futures and option contracts
 
Dekatherms
 
March 2019
 
12.7

 
14.8

 
9.0

FTRs contracts
 
Kilowatt hours
 
May 2018
 
25.5

 
101.2

 
14.6

Non-utility Operations
 
 
 
 
 
 
 
 
 
 
LPG swaps & options
 
Gallons
 
March 2020
 
229.2

 
325.5

 
241.6

Natural gas futures, forward and pipeline contracts (a)
 
Dekatherms
 
March 2022
 
128.9

 
75.9

 
56.5

Natural gas basis swap contracts
 
Dekatherms
 
March 2022
 
74.1

 
104.2

 
107.2

NYMEX natural gas storage
 
Dekatherms
 
March 2019
 
0.9

 
1.9

 
1.4

NYMEX propane storage
 
Gallons
 
N/A
 
—

 
0.3

 
—

Electricity long forward and futures contracts (a)
 
Kilowatt hours
 
January 2022
 
4,184.1

 
4,440.3

 
668.7

Electricity short forward and futures contracts
 
Kilowatt hours
 
May 2021
 
490.9

 
447.0

 
526.1

Interest Rate Risk:
 
 
 
 
 
 
 
 
 
 
Interest rate swaps
 
Euro
 
October 2020
 
€
645.8

 
€
645.8

 
€
645.8

Foreign Currency Exchange Rate Risk:
 
 
 
 
 
 
 
 
 
 
Forward foreign currency exchange contracts
 
USD
 
September 2021
 
$
496.2

 
$
424.8

 
$
321.8

Cross-currency contracts
 
USD
 
April 2020
 
$
49.9

 
$
59.1

 
$
59.1


(a)
Amounts at March 31, 2018 and September 30, 2017, include derivative contracts held by DVEP which was acquired on August 31, 2017.
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 March 31, 2018, September 30, 2017 and March 31, 2017:
 
 
March 31,
2018
 
September 30,
2017
 
March 31,
2017
Derivative assets:
 
 
 
 
 
 
Derivatives designated as hedging instruments:
 
 
 
 
 
 
Foreign currency contracts
 
$
0.3

 
$
3.2

 
$
14.2

Cross-currency contracts
 
—

 
—

 
3.0

 
 
0.3

 
3.2

 
17.2

Derivatives subject to PGC and DS mechanisms:
 
 
 
 
 
 
Commodity contracts
 
0.9

 
1.7

 
2.1

Derivatives not designated as hedging instruments:
 
 
 
 
 
 
Commodity contracts
 
65.7

 
102.4

 
71.9

Foreign currency contracts
 
13.6

 
9.0

 
1.4

 
 
79.3

 
111.4

 
73.3

Total derivative assets — gross
 
80.5

 
116.3

 
92.6

Gross amounts offset in the balance sheet
 
(31.5
)
 
(35.7
)
 
(31.8
)
Cash collateral received
 
(0.4
)
 
(8.3
)
 
(0.2
)
Total derivative assets — net
 
$
48.6

 
$
72.3

 
$
60.6

Derivative liabilities:
 
 
 
 
 
 
Derivatives designated as hedging instruments:
 
 
 
 
 
 
Foreign currency contracts
 
$
(4.0
)
 
$
(5.5
)
 
$
—

Cross-currency contracts
 
(2.2
)
 
(2.9
)
 
—

Interest rate contracts
 
(1.9
)
 
(2.3
)
 
(2.2
)
 
 
(8.1
)
 
(10.7
)
 
(2.2
)
Derivatives subject to PGC and DS mechanisms:
 
 
 
 
 
 
Commodity contracts
 
(0.6
)
 
(1.5
)
 
(0.2
)
Derivatives not designated as hedging instruments:
 
 
 
 
 
 
Commodity contracts
 
(37.2
)
 
(37.6
)
 
(38.8
)
Foreign currency contracts
 
(39.5
)
 
(32.7
)
 
(1.5
)
 
 
(76.7
)
 
(70.3
)
 
(40.3
)
Total derivative liabilities — gross
 
(85.4
)
 
(82.5
)
 
(42.7
)
Gross amounts offset in the balance sheet
 
31.5

 
35.7

 
31.8

Total derivative liabilities — net
 
$
(53.9
)
 
$
(46.8
)
 
$
(10.9
)
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 condensed consolidated statements of income and changes in AOCI for the six months ended March 31, 2018 and 2017:
Three Months Ended March 31,:
 
 
 
 
 
 
 
 
 
 
 
 
Gain (Loss)
Recognized in
AOCI
 
Gain (Loss)
Reclassified from
AOCI into Income
 
Location of Gain (Loss) Reclassified from
AOCI into Income
Cash Flow Hedges:
 
2018
 
2017
 
2018
 
2017
 
Foreign currency contracts
 
$
(3.1
)
 
$
(1.7
)
 
$
(3.9
)
 
$
8.9

 
Cost of sales
Cross-currency contracts
 
0.3

 
0.3

 
0.3

 
—

 
Interest expense/other operating income, net
Interest rate contracts
 
0.5

 
0.6

 
(0.7
)
 
(1.0
)
 
Interest expense
Total
 
$
(2.3
)
 
$
(0.8
)
 
$
(4.3
)
 
$
7.9

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Gain (Loss)
Recognized in Income
 
Location of Gain (Loss)
Recognized in Income
 

Derivatives Not Designated as Hedging Instruments:
 
2018
 
2017
 
 
 
Commodity contracts
 
$
(41.8
)
 
$
22.0

 
Cost of sales
 

Commodity contracts
 
(0.2
)
 
0.8

 
Revenues
 
 
Commodity contracts
 
0.1

 
0.1

 
Operating and administrative expenses
 

Foreign currency contracts
 
(11.0
)
 
(1.2
)
 
(Losses) gains on foreign currency contracts, net
 

Total
 
$
(52.9
)
 
$
21.7

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Six Months Ended March 31,:
 
 
 
 
 
 
 
 
 
 
 
 
Gain (Loss)
Recognized in
AOCI
 
Gain (Loss)
Reclassified from
AOCI into Income
 
Location of Gain (Loss) Reclassified from
AOCI into Income
Cash Flow Hedges:
 
2018
 
2017
 
2018
 
2017
 
Foreign currency contracts
 
$
(4.5
)
 
$
15.5

 
$
(3.1
)
 
$
16.8

 
Cost of sales
Cross-currency contracts
 
0.4

 
0.2

 
0.5

 
(0.3
)
 
Interest expense/other operating income, net
Interest rate contracts
 
1.2

 
1.8

 
(1.2
)
 
(2.0
)
 
Interest expense
Total
 
$
(2.9
)
 
$
17.5

 
$
(3.8
)
 
$
14.5

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Gain (Loss)
Recognized in Income
 
Location of Gain (Loss)
Recognized in Income
 
 
Derivatives Not Designated as Hedging Instruments:
 
2018
 
2017
 
 
 
Commodity contracts
 
$
(17.4
)
 
$
130.5

 
Cost of sales
 
 
Commodity contracts
 
(1.5
)
 
0.9

 
Revenues
 
 
Commodity contracts
 
0.2

 
—

 
Operating and administrative expenses
 
 
Foreign currency contracts
 
(15.8
)
 
0.1

 
(Losses) gains on foreign currency contracts, net
 
 
Total
 
$
(34.5
)
 
$
131.5