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Commitments and Contingencies (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Litigation matters [Member]
Dec. 31, 2012
Litigation matters [Member]
Loss Contingencies [Line Items]            
Litigation accruals on an undiscounted basis         $ 4.9 $ 4.4
Operating lease obligations [Abstract]            
Lease and rental expense included in costs and expenses 23.3 22.7 45.3 45.1    
Other claims [Abstract]            
Claims against various parties related to contractual agreements 41.8   41.8      
Claims against us related to contractual agreements $ 43.4   $ 43.4