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Credit Losses | 9 Months Ended
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Sep. 30, 2021
Receivables [Abstract] |
Credit Losses | Credit Losses The Company’s trade accounts receivable is one portfolio comprised of commercial businesses operating in the U.S. and to a much lesser extent, Canada. The Company develops its allowances for credit losses, which represent an estimate of expected losses over the remaining contractual life of its receivables, considering customer financial condition, historical loss experience with its customers, current market economic conditions and forecasts of future economic conditions when appropriate. When the Company becomes aware of a customer's inability to meet its financial obligation, a specific reserve is recorded to reduce the receivable to the expected amount to be collected. For the balance of its trade receivables, the Company uses a loss rate method to estimate its credit loss reserve. Historical loss experience rates are calculated using receivable write offs over a trailing twelve-month period and comparing that to the average receivable balances over the same period. That rate is applied to the current accounts receivable portfolio, excluding accounts that have been specifically reserved. Any write offs incurred are recorded against the established reserves. The Company grants credit to commercial business customers using an electronic application process that evaluates the customer's detailed credit report, reference responses, availability under credit facilities, existing liens, tenure of management and business history, among other factors. Credit terms are typically net 30 days payment required with larger businesses eligible for up to net 90 day terms, if qualified. 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 The entire disclosure for allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -URI http://asc.fasb.org/topic&trid=2196771 + Details
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- References No definition available. + Details
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