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Restructuring Expenses - Narrative (Details) - Employee severance - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
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Sep. 30, 2018 | Dec. 31, 2018
Q4 2018 Restructuring Plan |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring expenses |  | $ 1.3
Q1 2018 Restructuring Plan |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring expenses | $ 3.0 |

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- Definition Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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