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Debt and Credit Arrangements - Summary of Outstanding Borrowings (Details) - USD ($) | Jun. 30, 2019 | Dec. 31, 2018 | Nov. 06, 2017
--- | --- | --- | ---
Debt Instrument |  |  |
Total debt, net of unamortized discount and debt issuance costs | $ 309,200,000 | $ 544,400,000 |
Less: current maturities | (4,500,000) | (11,200,000) |
Long-term debt | 304,700,000 | 533,200,000 |
Foreign facilities |  |  |
Debt Instrument |  |  |
Long term debt | 4,500,000 | 11,200,000 |
Revolving Credit Facility | Senior secured revolving credit facility |  |  |
Debt Instrument |  |  |
Unamortized debt issuance costs | (9,900,000) |  |
Long term debt | 96,700,000 |  |
Revolving Credit Facility | Senior secured revolving credit facility due 2022 |  |  |
Debt Instrument |  |  |
Long term debt |  | 329,300,000 |
Revolving Credit Facility | Term loan |  |  |
Debt Instrument |  |  |
Long term debt | 0 | 0 |
Convertible Debt | Convertible Notes, due 2024 |  |  |
Debt Instrument |  |  |
Principal amount | 258,800,000 | 258,800,000 | $ 258,800,000
Unamortized discount | (46,600,000) | (50,400,000) |
Unamortized debt issuance costs | (4,200,000) | (4,500,000) |
Convertible Debt | $ 208,000,000.0 | $ 203,900,000 |

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