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Variable Interest Entities (Tables)
6 Months Ended
Jun. 30, 2012
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]  
Schedule of Variable Interest Entities
The carrying amounts and classification of our consolidated VIEs' assets and liabilities included in our condensed consolidated balance sheet are as follows:
In millions
As of
June 30, 2012
 
As of
December 31,  2011
Current assets
$
2.9

 
$
3.6

Noncurrent assets
52.8

 
62.7

Total assets
$
55.7

 
$
66.3

Current liabilities
$
(7.7
)
 
$
(10.9
)
Noncurrent liabilities
(49.6
)
 
(57.4
)
Total liabilities
$
(57.3
)
 
$
(68.3
)