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Revenue (Tables) | 12 Months Ended
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Dec. 31, 2021
Revenue from Contract with Customer [Abstract] |
Accounts Receivable 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 sheet caption: | Accounts receivable |  | Other current assets |  | Other assets |  | Other accruals |  | Other liabilities
Balance at December 31, 2020 | $ | 2,078.1 |  |  | $ | 52.0 |  |  | $ | 170.7 |  |  | $ | 266.3 |  |  | $ | 8.2 |
Balance at December 31, 2021 | 2,352.4 |  |  | 60.9 |  |  | 131.2 |  |  | 259.8 |  |  | 9.2 |
Schedule of Allowance for Doubtful Accounts | The following table summarizes the movement in the Company’s allowance for doubtful accounts:
|  | 2021 |  | 2020 |  | 2019
Beginning balance |  | $ | 53.5 |  |  | $ | 36.5 |  |  | $ | 45.9 |
Adjustment upon adoption of ASU 2016-13(1) |  |  |  | 3.0 |  |  |
Bad debt expense |  | 33.8 |  |  | 56.8 |  |  | 53.1 |
Uncollectible accounts written off, net of recoveries |  | (38.4) |  |  | (42.8) |  |  | (62.5) |
Ending balance |  | $ | 48.9 |  |  | $ | 53.5 |  |  | $ | 36.5 |
(1)The Company adopted ASU 2016-13 effective January 1, 2020, using the modified retrospective transition method, electing to not restate prior periods. Refer to Note 1 for additional detail.

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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=124255953&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=123351226&loc=SL49130551-203045 + Details
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