Annual report pursuant to Section 13 and 15(d)

Rentals Under Operating Leases (Details)

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Rentals Under Operating Leases (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Rentals Under Operating Leases [Abstract]      
2012 $ 211.3    
2013 191.1    
2014 160.2    
2015 134.7    
2016 102.1    
Thereafter 250.2    
Operating Leases, Future Minimum Payments Receivable 1,049.6    
Percentage Rents 0.2 0.1 0.2
Reimbursement income $ 26.1 $ 24.5 $ 27.6