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Acquisition - Narrative (Details) - Intermedix - USD ($)
$ in Millions
8 Months Ended 12 Months Ended
May 08, 2018
Dec. 31, 2018
Dec. 31, 2018
Jun. 30, 2019
Business Acquisition [Line Items]        
Purchase price after adjustments $ 469.2      
Debt issuance costs paid to Bank of America   $ 4.1    
Measurement period adjustment, deferred tax liability       $ 1.7
Acquisition-related Costs        
Business Acquisition [Line Items]        
Pro forma earnings adjustment to exclude from 2018 and include in 2017     $ 11.9