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Accounts Receivable (Tables) | 12 Months Ended
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Dec. 31, 2020
Receivables [Abstract] |
Schedule of allowance for bad debt | The following table sets forth activities in our allowance for credit losses (in millions):
| 2020 |  | 2019 |  | 2018
Balance as of beginning of period* | $ | 46.6 |  |  | $ | 39.4 |  |  | $ | 27.8 |
Charges to provision for credit losses | 63.7 |  |  | 25.9 |  |  | 25.1 |
Write-off of uncollectible receivables | (53.7) |  |  | (32.2) |  |  | (16.2) |
Recoveries of credit losses | 1.0 |  |  | 2.4 |  |  | 2.9 |
Translation adjustments | (0.3) |  |  | — |  |  | (0.1) |
Balance as of end of period | $ | 57.3 |  |  | $ | 35.5 |  |  | $ | 39.4 |
* For 2020, the balance as of the beginning of the period includes the $11.1 million cumulative transition adjustment related to the implementation of ASU 2016-13.

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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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