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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2013
Fair Value Disclosures [Abstract]  
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis
In millions
Level 1
 
Level 2
 
Carrying
Value
September 30, 2013
 
 
 
 
 
 
 
 
Investments
 
$
189.0

 
 
 
 
 
$
189.0

Derivative assets
 
137.9

 
 
$
73.9

 
 
211.8

Total assets at fair value
 
$
326.9

  
 
$
73.9

 
 
$
400.8

 
 
 
 
 
 
 
 
 
Derivative liabilities
 
 
 
 
$
(158.1
)
 
 
$
(158.1
)
Total liabilities at fair value
 
 
 
 
$
(158.1
)
 
 
$
(158.1
)