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Equity
6 Months Ended
Jun. 30, 2014
Equity [Abstract]  
Equity
Equity
Total equity as of June 30, 2014 increased $944.4 million compared to December 31, 2013. This increase was primarily driven by net income attributable to Biogen Idec Inc. of $1,194.5 million and an increase in additional paid in capital resulting from our share-based compensation arrangements totaling $82.4 million, partially offset by repurchases of our common stock totaling $336.9 million.
Share Repurchases
In February 2011, our Board of Directors authorized the repurchase of up to 20.0 million shares of common stock. This authorization does not have an expiration date. During the six months ended June 30, 2014, we repurchased approximately 1.2 million shares of common stock at a cost of $336.9 million for the purpose of share stabilization. During the six months ended June 30, 2013, we repurchased approximately 0.3 million shares of common stock at a cost of $41.0 million.
Approximately 3.0 million shares of our common stock remain available for repurchase under the 2011 authorization.
Noncontrolling Interests
The following table reconciles equity attributable to noncontrolling interests (NCI):
 
For the Three Months
Ended June 30,
 
For the Six Months
Ended June 30,
(In millions)
2014
 
2013
 
2014
 
2013
Noncontrolling interests, beginning of period
$
4.4

 
$
0.6

 
$
0.6

 
$
2.3

Net income (loss) attributable to noncontrolling interests, net of tax
8.6

 

 
8.4

 

Fair value of net assets and liabilities acquired and assigned to NCI

 

 
4.0

 

Distribution to noncontrolling interest
(9.1
)
 

 
(9.1
)
 

Deconsolidation of noncontrolling interest

 

 

 
(1.7
)
Noncontrolling interests, end of period
$
3.9

 
$
0.6

 
$
3.9

 
$
0.6