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Commitments and Contingencies (Leases, and LC and Guarantees ) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 31, 2012
Jun. 30, 2013
Jun. 30, 2012
Future Minimum Lease Payments under Operating Leases      
2013   $ 21.6  
2014   40.3  
2015   31.2  
2016   23.0  
2017   17.3  
2018   11.8  
Thereafter   82.8  
Future minimum lease payments, total   228.0  
Operating Leases, Rent Expense      
Lease and rental expense 21.5 25.4 21.5
Letters of credit and guarantees      
Irrevocable standby letters of credit and guarantees   $ 48.7