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Fair Value Measurements
9 Months Ended
Sep. 30, 2015
Fair Value Disclosures [Abstract]  
Fair Value Measurements
Fair Value Measurements
Following is a summary of the valuation techniques for assets and liabilities recorded in our Consolidated Balance Sheets at fair value on a recurring basis:
Foreign Currency Derivatives-The foreign currency derivative instruments that we currently use are forward contracts, zero-cost collars, and futures, which typically expire within eighteen months. Valuations are based on exchange-quoted prices, which are classified as Level 1. Some of the valuations are adjusted by a forward yield curve or interest rates. In such cases, these derivative contracts are classified within Level 2. As of September 30, 2015 and December 31, 2014, the gross asset position of our foreign currency derivative instruments was $14.5 million and $4.6 million, respectively, and the gross liability position of our foreign currency derivative instruments was $64.1 million and $39.8 million, respectively.
Commodity Derivatives-The commodity contracts primarily relate to natural gas. The commodity derivative instruments that we currently use are forward purchase contracts, swaps, and three-way collars. The natural gas contracts settle using NYMEX futures or AECO price indexes, which represent fair value at any given time. The contracts’ maturities are for future months and settlements are scheduled to coincide with anticipated gas purchases during those future periods. Quoted market prices from NYMEX and AECO are used to determine the fair value of these instruments. These market prices are adjusted by a forward yield curve and are classified within Level 2. As of September 30, 2015 and December 31, 2014, the gross asset position of our commodity derivative instruments was $0.5 million and $4.4 million, respectively, and the gross liability position of our commodity instruments was $15.0 million and $14.9 million, respectively.
Financial Instruments
The carrying amounts and estimated fair values of our financial instruments are as follows:
 
 
September 30, 2015
 
December 31, 2014
 
Carrying Amount
 
Fair Value
Carrying Amount
 
Fair Value
 
 
Cash and cash equivalents
$
1,284.9

 
$
1,284.9

 
$
2,374.6

 
$
2,374.6

 
Receivables, net
675.1

 
675.1

 
754.4

 
754.4

 
Accounts payable
657.0

 
657.0

 
559.6

 
559.6

 
Short-term debt
18.0

 
18.0

 
13.5

 
13.5

 
Structured accounts payable arrangements
257.9

 
257.9

 
237.7

 
237.7

 
Long-term debt, including current portion
3,780.3

 
3,894.9

 
3,819.0

 
4,101.2


For cash and cash equivalents, receivables, net, accounts payable, short-term debt and structured accounts payable arrangements, the carrying amount approximates fair value because of the short-term maturity of those instruments. The fair value of long-term debt, including the current portion, is estimated using quoted market prices for the publicly registered notes and debentures, classified as Level 1 and Level 2, respectively, within the fair value hierarchy, depending on the market liquidity of the debt.