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Commitments and Contingencies (Details 2) (USD $)
In Millions, unless otherwise specified
12 Months Ended 0 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Jun. 10, 2013
Pending Litigation
District of Connecticut, July 2012 Lawsuit
Jul. 25, 2012
Pending Litigation
District of Connecticut, July 2012 Lawsuit
Item
Loss contingency disclosures          
Number of former employees against whom the entity filed lawsuit         2
Number of former employees owning the corporation against which the entity filed lawsuit         1
Amount of damages alleged by defendant corporation for lost profits       $ 155  
Future minimum payments under operating leases          
2014 16.8        
2015 15.9        
2016 14.5        
2017 12.4        
2018 11.1        
2019 and beyond 35.6        
Future minimum rentals to be received under operating subleases          
2014 0.5        
2015 0.3        
Rent expense 15.2 19.5 19.3    
Future minimum payments under capital leases net of leasehold improvement allowances          
2014 0.9        
2015 2.1        
2016 3.2        
2017 3.3        
2018 3.4        
2019 and beyond 21.3        
Capital lease obligations imputed interest $ 7.5