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Restructuring Expenses - Narrative (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2018
Q4 2018 Restructuring Plan | Employee severance |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring expenses |  | $ 1.3
Q1 2018 Restructuring Plan | Employee severance |  |
Restructuring Cost and Reserve [Line Items] |  |
Payments for Restructuring | $ 1.9 |
Q1 2018 Restructuring Plan | Restructuring Cost |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring expenses | $ 3.0 |

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