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Commitments and Contingencies (Leases, and LC and Guarantees ) (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Future Minimum Lease Payments under Operating Leases    
2012 $ 20.2  
2013 37.4  
2014 33.0  
2015 26.8  
2016 20.0  
2017 16.5  
Thereafter 95.1  
Future minimum lease payments, total 249.0  
Operating Leases, Rent Expense    
Lease and rental expense 21.5 17.7
Letters of credit and guarantees    
Irrevocable standby letters of credit and guarantees $ 35.7