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Acquisitions - US Resources Healthcare and Mediscan (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
May 03, 2017
Sep. 30, 2018
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2016
Oct. 30, 2015
Mediscan              
Business Acquisition [Line Items]              
Release of escrow to seller $ 5.0            
Contingent consideration, range of outcomes, high             $ 7.0
Potential Earnout, Attainment of Specific Performance Criteria in 2017 | Mediscan              
Business Acquisition [Line Items]              
Contingent consideration, range of outcomes, high             3.5
Acquisition-Related Contingent Consideration | US Resources Healthcare, LLC              
Business Acquisition [Line Items]              
Change in value of contingent liability   $ (0.2) $ (1.3)        
Potential Earnout, Attainment of Specific Performance Criteria in 2016 | Mediscan              
Business Acquisition [Line Items]              
Contingent consideration, range of outcomes, high             $ 3.5
Assumed Additional Contingent Purchase Price Liabilities | Mediscan              
Business Acquisition [Line Items]              
Contingent consideration, range of outcomes, high     $ 0.3   $ 0.3 $ 0.3  
Payments for previous acquisition       $ 0.3 $ 0.3    
Contingent consideration liabilities       $ 7.3