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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Services        
Segment Reporting Information [Line Items]        
Intangible asset amortization expense $ 2.8 $ 2.9 $ 5.2 $ 5.5