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Debt and Credit Arrangements - Summary of Outstanding Borrowings (Details) - USD ($) | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Aug. 01, 2018 | Dec. 31, 2017 | Nov. 06, 2017
Debt Instrument |  |  |  |
Document Period End Date | Sep. 30, 2018 |  |  |
Total debt, net of unamortized discount and debt issuance costs | $ 510,200,000 |  | $ 498,100,000 |
Less: current maturities | (9,700,000) |  | (58,900,000) |
Long-term debt | 500,500,000 |  | 439,200,000 |
Foreign facilities |  |  |  |
Debt Instrument |  |  |  |
Long term debt | 9,700,000 |  | 7,900,000 |
Revolving Credit Facility | Senior secured revolving credit facility due November 2022 |  |  |  |
Debt Instrument |  |  |  |
Unamortized debt issuance costs | (2,000,000) |  |  |
Long term debt | 298,500,000 |  | 239,000,000 |
Convertible Debt | Convertible Notes, due 2024 |  |  |  |
Debt Instrument |  |  |  |
Principal amount | 258,800,000 |  | 258,800,000 | $ 258,800,000.0
Unamortized discount | (52,200,000) |  | (57,600,000) |
Unamortized debt issuance costs | (4,600,000) |  | (5,100,000) |
Convertible Debt | 202,000,000 |  | 196,100,000 |
Convertible Debt | Convertible Notes, Due 2018 |  |  |  |
Debt Instrument |  |  |  |
Principal amount | 0 | $ 57,100,000 | 57,100,000 |
Unamortized discount | 0 |  | (1,900,000) |
Unamortized debt issuance costs | 0 |  | (100,000) |
Convertible Debt | $ 0 |  | 55,100,000 |
Convertible debt, current |  |  | $ 55,100,000 |

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