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Derivative Instruments and Hedging Activities (Tables)
 3 Months Ended
Dec. 31, 2017
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 December 31, 2017, September 30, 2017 and December 31, 2016, and the final settlement date of the Company's open derivative transactions as of December 31, 2017, excluding those derivatives that qualified for the NPNS exception:
 
 
 
 
 
 
Notional Amounts
(in millions)
Type
 
Units
 
Settlements Extending Through
 
December 31, 2017
 
September 30, 2017
 
December 31, 2016
Commodity Price Risk:
 
 
 
 
 
 
 
 
 
 
Regulated Utility Operations
 
 
 
 
 
 
 
 
 
 
Gas Utility NYMEX natural gas futures and option contracts
 
Dekatherms
 
September 2018
 
13.4

 
14.8

 
11.7

FTRs contracts
 
Kilowatt hours
 
May 2018
 
63.1

 
101.2

 
36.2

Non-utility Operations
 
 
 
 
 
 
 
 
 
 
LPG swaps & options
 
Gallons
 
December 2020
 
275.4

 
325.5

 
325.9

Natural gas futures, forward and pipeline contracts (a)
 
Dekatherms
 
December 2021
 
128.3

 
75.9

 
70.2

Natural gas basis swap contracts
 
Dekatherms
 
March 2022
 
90.2

 
104.2

 
120.1

NYMEX natural gas storage
 
Dekatherms
 
March 2019
 
1.3

 
1.9

 
1.3

NYMEX propane storage
 
Gallons
 
March 2018
 
0.1

 
0.3

 
—

Electricity long forward and futures contracts (a)
 
Kilowatt hours
 
May 2021
 
4,733.9

 
4,440.3

 
685.5

Electricity short forward and futures contracts
 
Kilowatt hours
 
May 2021
 
325.2

 
447.0

 
352.5

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
 
August 2021
 
$
485.7

 
$
424.8

 
$
416.7

Cross-currency contracts
 
USD
 
April 2020
 
$
49.9

 
$
59.1

 
$
59.1


(a)
Amounts at December 31, 2017 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 December 31, 2017, September 30, 2017 and December 31, 2016:
 
 
December 31,
2017
 
September 30,
2017
 
December 31,
2016
Derivative assets:
 
 
 
 
 
 
Derivatives designated as hedging instruments:
 
 
 
 
 
 
Foreign currency contracts
 
$
1.2

 
$
3.2

 
$
24.6

Cross-currency contracts
 
—

 
—

 
3.5

 
 
1.2

 
3.2

 
28.1

Derivatives subject to PGC and DS mechanisms:
 
 
 
 
 
 
Commodity contracts
 
0.4

 
1.7

 
6.9

Derivatives not designated as hedging instruments:
 
 
 
 
 
 
Commodity contracts
 
119.2

 
102.4

 
117.6

Foreign currency contracts
 
10.4

 
9.0

 
1.4

 
 
129.6

 
111.4

 
119.0

Total derivative assets — gross
 
131.2

 
116.3

 
154.0

Gross amounts offset in the balance sheet
 
(32.5
)
 
(35.7
)
 
(35.7
)
Cash collateral received
 
(12.0
)
 
(8.3
)
 
(7.1
)
Total derivative assets — net
 
$
86.7

 
$
72.3

 
$
111.2

Derivative liabilities:
 
 
 
 
 
 
Derivatives designated as hedging instruments:
 
 
 
 
 
 
Foreign currency contracts
 
$
(5.6
)
 
$
(5.5
)
 
$
—

Cross-currency contracts
 
(0.9
)
 
(2.9
)
 
—

Interest rate contracts
 
(2.1
)
 
(2.3
)
 
(2.8
)
 
 
(8.6
)
 
(10.7
)
 
(2.8
)
Derivatives subject to PGC and DS mechanisms:
 
 
 
 
 
 
Commodity contracts
 
(2.3
)
 
(1.5
)
 
(0.3
)
Derivatives not designated as hedging instruments:
 
 
 
 
 
 
Commodity contracts
 
(42.2
)
 
(37.6
)
 
(65.2
)
Foreign currency contracts
 
(34.3
)
 
(32.7
)
 
(0.2
)
 
 
(76.5
)
 
(70.3
)
 
(65.4
)
Total derivative liabilities — gross
 
(87.4
)
 
(82.5
)
 
(68.5
)
Gross amounts offset in the balance sheet
 
32.5

 
35.7

 
35.7

Total derivative liabilities — net
 
$
(54.9
)
 
$
(46.8
)
 
$
(32.8
)
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 condensed consolidated statements of income and changes in AOCI for the three months ended December 31, 2017 and 2016:
Three Months Ended December 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:
 
2017
 
2016
 
2017
 
2016
 
Foreign currency contracts
 
$
(1.4
)
 
$
17.2

 
$
0.8

 
$
7.9

 
Cost of sales
Cross-currency contracts
 
0.1

 
(0.1
)
 
0.2

 
(0.3
)
 
Interest expense/other operating income, net
Interest rate contracts
 
0.7

 
1.2

 
(0.5
)
 
(1.0
)
 
Interest expense
Total
 
$
(0.6
)
 
$
18.3

 
$
0.5

 
$
6.6

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Gain (Loss)
Recognized in Income
 
Location of Gain (Loss)
Recognized in Income
 
 
Derivatives Not Designated as Hedging Instruments:
 
2017
 
2016
 
 
 
Commodity contracts
 
$
24.4

 
$
108.5

 
Cost of sales
 
 
Commodity contracts
 
(1.3
)
 
0.1

 
Revenues
 
 
Commodity contracts
 
0.1

 
(0.1
)
 
Operating and administrative expenses
 
 
Foreign currency contracts
 
(4.8
)
 
1.3

 
(Losses) gains on foreign currency contracts, net
 
 
Total
 
$
18.4

 
$
109.8