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Share Capital
 12 Months Ended
Dec. 31, 2011
Stockholders' Equity Attributable to Parent [Abstract]  
Share Capital
SHARE CAPITAL

Movements in the number of common shares and common share equivalents issued are represented in the table below:
In millions
Year ended December 31, 2011
 
Year ended December 31, 2010
 
Year ended December 31, 2009
Common shares issued - beginning balance
490.4

 
459.5

 
426.6

Issue of new shares
—

 
30.9

 
32.9

Common shares issued - ending balance
490.4

 
490.4

 
459.5

Less: Treasury shares for which dividend and voting rights do not apply
(44.4
)
 
(30.3
)
 
(28.1
)
Common shares outstanding
446.0

 
460.1

 
431.4



During the year ended December 31, 2011, the company repurchased 18.8 million shares (three months ended December 31, 2011: 5.3 million shares) in the market at a cost of $436.5 million (three months ended December 31, 2011: $103.4 million cost) (year ended December 31, 2010: 9.4 million shares, at a cost of $192.2 million). Separately, an aggregate of 3.1 million shares were withheld on vesting events during the year ended December 31, 2011 to meet employees' withholding tax obligations (December 31, 2010: 1.9 million). The fair value of these shares withheld at the respective withholding dates was $76.6 million (December 31, 2010: $47.9 million). Approximately $732 million remained authorized under the company's share repurchase plan at December 31, 2011 (December 31, 2010: $1.2 billion).

Total treasury shares at December 31, 2011 were 54.0 million (December 31, 2010: 42.7 million), including 9.6 million unvested restricted stock awards (December 31, 2010: 12.4 million) for which dividend and voting rights apply. The market price of common shares at the end of 2011 was $20.09. The total market value of the company's 54.0 million treasury shares was $1.1 billion at December 31, 2011.

Movements in Treasury Shares comprise:
In millions
Year ended December 31, 2011
 
Year ended December 31, 2010
 
Year ended December 31, 2009
Beginning balance
42.7

 
40.2

 
50.7

Acquisition of common shares
21.8

 
11.3

 
1.6

Distribution of common shares
(9.6
)
 
(7.0
)
 
(7.5
)
Common shares distributed to meet option exercises
(0.9
)
 
(1.8
)
 
(4.6
)
Ending balance
54.0

 
42.7

 
40.2