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Debt and Credit Arrangements - Fair Value Disclosures about Debt (Details) - Convertible Debt | Sep. 30, 2018 | Dec. 31, 2017
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Convertible Notes, due 2024 |  |
Debt Instrument |  |
Debt instrument percentage over par value | 140.00% | 105.00%
Convertible Notes, Due 2018 |  |
Debt Instrument |  |
Debt instrument percentage over par value |  | 99.00%

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- Definition Debt Instrument Fair Value. Percentage over Par Value + References No definition available. + Details
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- Details
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- Details
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