Debt and Credit Arrangements - Fair Value Disclosures about Debt (Details)	Jun. 30, 2021	Dec. 31, 2020
Convertible Debt \| Convertible Notes, due 2024
Debt Instrument
Debt instrument percentage over par value	255.00%	210.00%

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration