Commitments and Contingencies - Legal Proceedings (Details)
$ in Millions
1 Months Ended 15 Months Ended
May 31, 2016
USD ($)
Apr. 30, 2016
USD ($)
Jun. 16, 2015
LegalMatter
Sep. 30, 2016
USD ($)
LegalMatter
Dec. 31, 2015
USD ($)
Loss Contingencies [Line Items]          
Loss accrual       $ 0.3 $ 0.4
Number of class actions filed (in legal matters) | LegalMatter     3    
Number of class actions dismissed (in legal matters) | LegalMatter       2  
Massachusetts Department of Revenue          
Loss Contingencies [Line Items]          
Litigation settlement, expense   $ 0.5      
Reduction to accrual   $ 0.2      
Connecticut Department of Social Services Office of Quality Assurance Audit          
Loss Contingencies [Line Items]          
Litigation settlement $ 0.5