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Lines of Credit and Financing Arrangements (Outstanding Debt Obligations) (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017 | Nov. 01, 2016
--- | --- | --- | ---
Short-Term Debt: |  |  |
Total short-term debt | $ 0 | $ 900,000 |
Current maturities of long-term debt: |  |  |
Capital lease obligations | 3,500,000 | 3,200,000 |
Domestic credit facility | 300,800,000 | 32,600,000 |
Long-Term Debt: |  |  |
Capital lease obligations | 15,700,000 | 11,900,000 |
Total long-term debt | 740,500,000 | 970,500,000 |
Debt Issuance Cost, Gross, Noncurrent | (3,200,000) | (4,400,000) |
Total debt | 1,041,300,000 | 1,004,000,000 |
Domestic Credit Facility [Member] |  |  |
Current maturities of long-term debt: |  |  |
Domestic credit facility | 30,000,000 | 30,000,000 |
Debt Issuance Costs, Gross, Current | (700,000) | (600,000) |
Long-Term Debt: |  |  |
Total long-term debt | 378,000,000 | 337,000,000 |
Asset Securitization [Member] |  |  |
Current maturities of long-term debt: |  |  |
Capital lease obligations | 268,000,000 | 0 |
Long-Term Debt: |  |  |
Total long-term debt | 0 | 276,000,000 |
Senior Unsecured Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, face amount |  |  | $ 350,000,000
Long-Term Debt: |  |  |
Total long-term debt | 350,000,000 | 350,000,000 |
Foreign Obligations [Member] |  |  |
Short-Term Debt: |  |  |
Total short-term debt | $ 0 | $ 900,000 |

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