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Share-Based Compensation (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
Executive
Type
Employee
shares
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
[1]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Share-based compensation costs $ 6.7 $ 17.5 $ 10.5
Total income tax benefit recognized $ 2.6 2.9 2.8
Number of former senior executives with unvested share-based payment awards vested | Executive 2    
Total unrecognized compensation cost related to nonvested share-based compensation arrangements granted $ 7.6    
Weighted average period for recognition of unrecognized compensation cost 1 year 3 months 18 days    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Types of share based awards | Type 3    
Number of shares reserved for future equity grants (in shares) | shares 1,200,000    
Discontinued Operations [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Share-based compensation costs [2] $ 0.0 10.1 3.4
TPHS Business [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Modification cost $ 7.4    
Number of employees considered for accelerating vesting dates to closing date | Employee 100    
Cost of Services [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Share-based compensation costs $ 2.2 1.2 0.9
Selling, General and Administrative Expenses [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Share-based compensation costs 4.4 5.9 6.0
Restructuring and Related Charges [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Share-based compensation costs $ 0.1 $ 0.3 $ 0.2
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 4 years    
Expiration period 10 years    
Stock Options [Member] | TPHS Business [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Modified shares (in shares) | shares 92,000    
Restricted Stock and Restricted Stock Units (RSUs) [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Restricted Stock and Restricted Stock Units (RSUs) [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 4 years    
Restricted Stock and Restricted Stock Units (RSUs) [Member] | TPHS Business [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Modified shares (in shares) | shares 396,000    
Performance-based Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Market Stock Units [Member] | TPHS Business [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Modified shares (in shares) | shares 75,000    
[1] Includes the acceleration of vesting in May 2015 of all unexercisable stock options and unvested time-based restricted stock units held by our former president and chief executive officer at the time of the termination of his employment.
[2] Includes the acceleration of vesting in 2016 of all unvested stock options, market stock units and restricted stock units held by two former senior executives as of the Closing who had accepted employment with Sharecare.