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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Intangible asset amortization expense | $ 2.9 | $ 3.3 | $ 8.4 | $ 9.6

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