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Leases (Tables)
12 Months Ended
Dec. 31, 2011
Leases [Abstract]  
Future minimum payments under noncancelable operating leases
Future minimum payments, by year and in the aggregate, under noncancelable operating leases with any remaining terms consist of the following as of December 31, 2011:
 
Year     
2012 $ 201.3  
2013  147.7  
2014  110.4  
2015  82.7  
2016  60.7  
Thereafter  141.5  
Total minimum lease payments $ 744.3