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Commitments and Contingencies (Leases, and LC and Guarantees ) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Mar. 31, 2012
Sep. 30, 2013
Sep. 30, 2012
Future Minimum Lease Payments under Operating Leases      
2013   $ 11.4  
2014   42.5  
2015   31.8  
2016   23.4  
2017   17.8  
2018   12.1  
Thereafter   83.2  
Future minimum lease payments, total   222.2  
Operating Leases, Rent Expense      
Lease and rental expense 31.4 35.5 31.4
Letters of credit and guarantees      
Irrevocable standby letters of credit and guarantees   $ 54.0