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Fair Value Disclosures (Narrative) (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
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Fair Value Disclosures [Abstract] |  |
Fair value of debt | $ 536.7 | $ 564.4
Book value of debt | 526.0 |
Fair value of accounts receivable | $ 54.5 | $ 107.2

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- Definition Total book value of all debt outstanding. + References No definition available. + Details
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Period Type: | instant

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- Definition Fair value portion of amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611 + Details
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Period Type: | instant

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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611 + Details
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Data Type: | xbrli:monetaryItemType
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Period Type: | instant

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- References No definition available. + Details
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