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Credit Losses (Tables) | 9 Months Ended
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Sep. 30, 2021
Receivables [Abstract] |
Allowance for Credit Losses on Trade Accounts Receivable | The following is a rollforward of the allowances for credit losses related to trade accounts receivable for September 30, 2021 (in millions):
|  | September 30, 2021
Balance at beginning of period |  | $ | 1.7 |
Current period provision |  | 1.8 |
Write-offs - trade accounts receivable |  | (1.3) |
Balance at end of period |  | $ | 2.2 |
The following is a rollforward of the allowances for credit losses related to trade receivables for the year ended December 31, 2020 (in millions):
|  | December 31, 2020
Balance at beginning of period |  | $ | 6.8 |
Current period provision |  | 1.2 |
Write-offs - trade accounts receivable |  | (0.7) |
Write-offs - notes and other receivables* |  | (5.6) |
Balance at end of period |  | $ | 1.7 |
*$5.6 million of reserves related to notes and other receivables originated in 2016 and this balance was written off in the second quarter of 2020.

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- Definition Allowance for Credit Losses on Trade Accounts Receivable [Table Text Block] + References No definition available. + Details
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- References No definition available. + Details
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Period Type: | duration