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Lines of Credit and Financing Arrangements (Outstanding Debt Obligations) (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016 | Nov. 01, 2016 | May 31, 2010
--- | --- | --- | --- | ---
Short-Term Debt: |  |  |  |
Total short-term debt | $ 900,000 | $ 52,400,000 |  |
Current maturities of long-term debt: |  |  |  |
Capital lease obligations | 3,200,000 | 800,000 |  |
Domestic credit facility | 32,600,000 | 200,100,000 |  |
Long-Term Debt: |  |  |  |
Capital lease obligations | 11,900,000 | 15,000,000 |  |
Total long-term debt | 970,500,000 | 615,700,000 |  |
Debt Issuance Cost, Gross, Noncurrent | (4,400,000) | (5,300,000) |  |
Total debt | 1,004,000,000 | 868,200,000 |  |
Domestic Credit Facility [Member] |  |  |  |
Current maturities of long-term debt: |  |  |  |
Domestic credit facility | 30,000,000 | 0 |  |
Debt Issuance Costs, Gross, Current | (600,000) | (700,000) |  |
Long-Term Debt: |  |  |  |
Total long-term debt | 337,000,000 | 256,000,000 |  |
Asset Securitization [Member] |  |  |  |
Long-Term Debt: |  |  |  |
Total long-term debt | 276,000,000 | 0 |  |
Senior Unsecured Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount |  |  | $ 350,000,000.0 | $ 200,000,000.0
Current maturities of long-term debt: |  |  |  |
Domestic credit facility | 0 | 200,000,000 |  |
Long-Term Debt: |  |  |  |
Total long-term debt | 350,000,000 | 350,000,000 |  |
Asset Securitization [Member] |  |  |  |
Short-Term Debt: |  |  |  |
Total short-term debt | 0 | 50,000,000 |  |
Foreign Obligations [Member] |  |  |  |
Short-Term Debt: |  |  |  |
Total short-term debt | $ 900,000 | $ 2,400,000 |  |

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