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Commitments and Contingencies (Schedule of Future Minimum Lease Payments under Noncancelable Operatng Leases) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]      
2015 $ 19.1    
2016 16.6    
2017 15.3    
2018 14.1    
2019 9.2    
Thereafter 23.8    
Operating Leases, Future Minimum Payments Due 98.1    
Rent expense $ 37.4 $ 41.8 $ 16.4