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Debt and Credit Arrangements - Fair Value Disclosures about Debt (Details) - Convertible Debt	Dec. 31, 2019	Dec. 31, 2018
Convertible Notes, due 2024
Debt Instrument
Debt instrument percentage over par value	132.00%	124.00%
Convertible Notes, due 2018
Debt Instrument
Debt instrument percentage over par value		99.00%

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Debt Instrument Fair Value. Percentage over Par Value

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