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Contingencies (Details) - USD ($)
$ in Millions
1 Months Ended
Feb. 11, 2016
Dec. 17, 2015
Dec. 31, 2015
Mar. 31, 2016
Loss Contingencies [Line Items]        
Value of the service guarantee       $ 1.0
Settled Litigation | FTC Contempt Action        
Loss Contingencies [Line Items]        
Payments for legal settlements   $ 100.0 $ 100.0  
Amount distributed to the overseeing court   68.0    
Amount authorized to fund consumer redress by any states' attorneys general   $ 32.0    
Settled Litigation | Ebarle Class Action        
Loss Contingencies [Line Items]        
Amount distributed to the overseeing court $ 68.0      
Pending litigation | FTC Contempt Action        
Loss Contingencies [Line Items]        
Loss contingency accrual       3.0
Pending litigation | Ebarle Class Action        
Loss Contingencies [Line Items]        
Loss contingency accrual       $ 13.0