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Restructuring and Impairment Charges - Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 24, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2019
Arizona |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges |  |  | $ 0.6 | $ 0.5 | $ 2.4 |  |
Employee Severance |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges |  | $ 0.3 |  | 0.6 |  |  |
Restructuring charges, fair value |  |  |  | 1.1 |  |  |
Restructuring costs |  |  |  | 0.1 | $ 0.4 |  |
Facility Consolidation |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges | $ 2.0 | $ 0.5 |  | $ 1.0 |  |  |
Restructuring costs | 1.2 |  |  |  |  |  |
Severance and retention expenses | $ 0.8 |  |  |  |  |  |
Forecast | Facility Consolidation |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Expected cost to be paid |  |  |  |  |  | $ 1.5 | $ 0.5
Minimum | Forecast | Facility Consolidation |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Estimated capital expenditures |  |  |  |  |  | 1.2 |
Maximum | Forecast | Facility Consolidation |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Estimated capital expenditures |  |  |  |  |  | $ 1.4 |

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