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Commitments, Contingencies, and Uncertainties (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Loss Contingencies [Line Items]      
Rent expense $ 78.0 $ 79.4 $ 77.4
Minium annual rentals 2013 52.1    
Minium annual rentals 2014 41.9    
Minium annual rentals 2015 25.3    
Minium annual rentals 2016 9.8    
Minium annual rentals 2017 6.1    
Minium annual rentals thereafter 16.4    
Committed for capital expenditures to be completed during 2013 6.7    
ABF Lawsuit - Threatened Litigation [Member]
     
Loss Contingencies [Line Items]      
Loss contingency, damages sought $ 750.0