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Fair Value Measurements
6 Months Ended
Jun. 30, 2013
Fair Value Disclosures [Abstract]  
Fair Value Measurements
Fair Value Measurements
The Company measures certain financial assets and liabilities at fair value. Fair value disclosures are reflected in a three-level hierarchy, maximizing the use of observable inputs and minimizing the use of unobservable inputs. The Company did not have any significant changes to the valuation techniques used to measure fair value as described in the Company's December 31, 2012 Annual Report on Form 10-K.

Certain Financial Assets and Liabilities Measured at Fair Value
The following table presents financial assets and liabilities measured at fair value on a recurring basis:
In millions
Level 1
 
Level 2
 
Carrying
Value
June 30, 2013
 
 
 
 
 
 
 
 
Investments
 
$
180.8

 
 
 
 
 
$
180.8

Derivative assets
 
141.0

 
 
$
83.2

 
 
224.2

Total assets at fair value
 
$
321.8

  
 
$
83.2

 
 
$
405.0

 
 
 
 
 
 
 
 
 
Derivative liabilities
 
 
 
 
$
(101.8
)
 
 
$
(101.8
)
Total liabilities at fair value
 
 
 
 
$
(101.8
)
 
 
$
(101.8
)


Certain Financial Assets and Liabilities not Measured at Fair Value
At June 30, 2013, the fair value of the Company’s debt obligations was estimated at $14.5 billion, compared to a carrying amount of $13.4 billion. The fair value was based upon quoted market prices, Level 2, within the valuation hierarchy. The carrying amounts of cash and equivalents and notes receivable approximate fair value.