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Summary of Significant Accounting Policies (Details)
$ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
Program
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Mar. 11, 2015
Schedule of Equity Method Investments [Line Items]        
Number of programs | Program 3      
Accounts Receivable, Net [Abstract]        
Total contractual allowances and allowance for doubtful accounts $ 0.7 $ 0.7    
Property, Plant and Equipment [Line Items]        
Depreciation 3.6 6.3 $ 6.5  
Finite-Lived Intangible Assets [Line Items]        
Intangible assets not subject to amortization $ 29.0 $ 29.0    
Minimum [Member]        
Finite-Lived Intangible Assets [Line Items]        
Estimated useful life 3 years      
Maximum [Member]        
Finite-Lived Intangible Assets [Line Items]        
Estimated useful life 10 years      
Computer Software and Hardware [Member] | Minimum [Member]        
Property, Plant and Equipment [Line Items]        
Useful life 3 years      
Computer Software and Hardware [Member] | Maximum [Member]        
Property, Plant and Equipment [Line Items]        
Useful life 7 years      
Furniture and Other Office Equipment [Member] | Minimum [Member]        
Property, Plant and Equipment [Line Items]        
Useful life 4 years      
Furniture and Other Office Equipment [Member] | Maximum [Member]        
Property, Plant and Equipment [Line Items]        
Useful life 7 years      
Leasehold Improvements [Member] | Minimum [Member]        
Property, Plant and Equipment [Line Items]        
Useful life 2 years      
Leasehold Improvements [Member] | Maximum [Member]        
Property, Plant and Equipment [Line Items]        
Useful life 15 years      
SulAmerica [Member]        
Schedule of Equity Method Investments [Line Items]        
Percentage of ownership interest acquired in joint venture       49.00%