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v3.19.3.a.u2

Restructuring Expenses (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) segment
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 |
2017 Restructuring Plan |  |
Restructuring Cost and Reserve [Line Items] |  |
Number of positions eliminated | segment |  | 100
Restructuring payments |  | $ 4.2
2017 Restructuring Plan | Employee severance I Restructuring Cost and Reserve |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring expenses |  | 3.7
2017 Restructuring Plan | Facility Closing I Restructuring Cost and Reserve |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring expenses |  | $ 0.6

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