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Commitments and contigencies (Tables)
12 Months Ended
Dec. 31, 2011
Commitments and contingencies [Abstract]  
The future minimum lease payments due under noncancelable operating leases
         

Year Ended December 31,

  Minimum  Lease
Payments
 

2012

  $ 33.3  

2013

    31.5  

2014

    27.2  

2015

    25.4  

2016

    23.8  

Thereafter

    43.8  
   

 

 

 
    $ 185.0  
   

 

 

 
Future purchase commitments
         

Year Ended December 31,

  Future
Purchase Commitment
 

2012

  $ 120.9  

2013

    36.6  

2014

    27.2  

2015

    1.7  

2016

    0.5  

Thereafter

    —    
   

 

 

 
    $ 186.9