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Fair value measurements (Tables)
12 Months Ended
Dec. 31, 2010
Fair value measurements (Tables) [Abstract] 
Carrying values and the fair values of Senior Notes
                                 
    December 31, 2010     December 31, 2009  

(in millions)

  Carrying
Amount
    Fair
Value
    Carrying
Amount
    Fair
Value
 

5.25% senior notes due 2012, net of unamortized discount

  $ 999.6     $ 1,056.0     $ 999.4     $ 1,068.6  

6.25% senior notes due 2014, net of unamortized discount

    996.9       1,116.0       996.1       1,095.7  

7.25% senior notes due 2019, net of unamortized discount

    497.1       586.3       496.8       591.6  
   

 

 

   

 

 

   

 

 

   

 

 

 

Total

  $ 2,493.6     $ 2,758.3     $ 2,492.3     $ 2,755.9