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Financial Instruments and Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2012
Fair Value Disclosures [Abstract]  
Summary Of Carrying Values And Fair Values Of Fixed Rate Debt
A summary of the aggregate carrying values and fair values of our fixed rate debt are as follows:
 
June 30,
2012
 
December 31,
2011
Carrying value
$
998.5

 
$
652.0

Fair value
$
1,058.2

 
$
675.6