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Accounts Receivable | 12 Months Ended
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Dec. 31, 2020
Receivables [Abstract] |
Accounts Receivable | 4. Accounts Receivable An allowance for doubtful accounts is maintained for estimated losses resulting from the inability of our customers to make required payments. Accounts receivable are stated net of the allowance for doubtful accounts of $51.3 million at December 31, 2020 ($59.9 million at December 31, 2019 and $62.1 million at December 31, 2018).

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- Definition The entire disclosure for financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2196816 + Details
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