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Debt and Credit Arrangements - Summary of Outstanding Borrowings (Details) - USD ($) | Sep. 30, 2019 | Dec. 31, 2018 | Nov. 06, 2017
--- | --- | --- | ---
Debt Instrument |  |  |
Total debt, net of unamortized discount and debt issuance costs | $ 808,400,000 | $ 544,400,000 |
Less: current maturities | (15,900,000) | (11,200,000) |
Long-term debt | 792,500,000 | 533,200,000 |
Foreign facilities |  |  |
Debt Instrument |  |  |
Foreign facilities | 4,300,000 | 11,200,000 |
Revolving Credit Facility | Credit Facilities 2019 |  |  |
Debt Instrument |  |  |
Unamortized debt issuance costs | (5,800,000) |  |
Senior secured revolving credit facilities and term loan, net of debt issuance costs | 594,000,000.0 |  |
Revolving Credit Facility | Term loan |  |  |
Debt Instrument |  |  |
Long term debt | 450,000,000.0 |  |
Revolving Credit Facility | Senior secured revolving credit facility |  |  |
Debt Instrument |  |  |
Long term debt | 149,800,000 |  |
Unamortized debt issuance costs | (9,500,000) |  |
Revolving Credit Facility | Senior secured revolving credit facility due 2022 |  |  |
Debt Instrument |  |  |
Long term debt |  | 329,300,000 |
Unamortized debt issuance costs | (2,500,000) |  |
Senior secured revolving credit facilities and term loan, net of debt issuance costs |  | 329,300,000 |
Convertible Debt | Convertible Notes, due 2024 |  |  |
Debt Instrument |  |  |
Unamortized debt issuance costs | (4,000,000.0) | (4,500,000) |
Principal amount | 258,800,000 | 258,800,000 | $ 258,800,000
Unamortized discount | (44,700,000) | (50,400,000) |
Convertible Debt | $ 210,100,000 | $ 203,900,000 |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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