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REVENUE (Tables) | 3 Months Ended
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Mar. 31, 2021
Revenue from Contract with Customer [Abstract] |
Accounts receivables and current and long-term contract assets and liabilities | The Company’s Accounts receivable and current and long-term contract assets and liabilities are summarized in the following table.
| Accounts Receivable, Less Allowance |  | Contract Assets (Current) |  | Contract Assets (Long-Term) |  | Contract Liabilities (Current) |  | Contract Liabilities (Long-Term)
Balance at December 31, 2020 | $ | 2,078.1 |  |  | $ | 52.0 |  |  | $ | 170.7 |  |  | $ | 266.3 |  |  | $ | 8.2 |
Balance at March 31, 2021 | 2,414.1 |  |  | 61.7 |  |  | 157.2 |  |  | 182.6 |  |  | 8.4 |
Schedule of allowance for doubtful accounts | The following table summarizes the movement in the Company's allowance for doubtful accounts:
| 2021 |  | 2020
Balance at January 1 | $ | 53.5 |  |  | $ | 36.5 |
Adjustment upon adoption of ASU 2016-13 | — |  |  | 3.0 |
Bad debt expense | 6.4 |  |  | 30.2 |
Uncollectible accounts written off, net of recoveries | (1.1) |  |  | (9.5) |
Balance at March 31 | $ | 58.8 |  |  | $ | 60.2 |

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- Definition Tabular disclosure of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045 + Details
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