Table:
| Description | Balance at Beginning of Period |  | Write-offs | Other | Balance at End of Period |
| --- | --- | --- | --- | --- | --- |
| Allowance for doubtful accounts |  |  |  |  |  |
| 2019 | $1.0 | $1.0 | $(0.8) | $0.0 | $1.2 (1) |
| 2018 | $1.1 | $0.7 | $(0.8) | $0.0 | $1.0 (1) |
| 2017 | $9.1 | $1.0 | $(0.9) | $0.0 | $1.1 (1) (2) |
| Allowance for sales returns (4) |  |  |  |  |  |
| 2019 | $0.0 | $0.0 | $0.0 | $0.0 | $0.0 |
| 2018 | $0.0 | $0.0 | $0.0 | $0.0 | $0.0 |
| 2017 | $1.4 | $1.4 | $0.0 | $(1.4) (3) | $1.4 |
| Allowance for inventory returns (5) |  |  |  |  |  |
| 2019 | $0.0 | $0.0 | $0.0 | $0.0 | $0.0 |
| 2018 | $0.0 | $0.0 | $0.0 | $0.0 | $0.0 |
| 2017 | $(0.6) | $(0.5) | $0.0 | $0.6 (3) | $(0.5) |
| Allowance for deferred tax assets |  |  |  |  |  |
| 2019 | $18.3 | $(0.3) | $0.0 | $(1.2) | $16.8) |
| 2018 | $18.3 | $(0.3) | $0.0 | $0.3 | $18.3 |
| 2017 | $69.0 | $(28.6) | $(2.9) | $(19.2) | $18.3 |
Paragraphs:
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS
For the years ended December: (in millions)
(1) Excludes approximately $5.6 million of reserves related to notes receivable and tax refund receivables originated in 2016.
(2) Excludes approximately $0.4 million of reserves related to non-trade receivables.
(3) Amounts represent gross revenue and cost reversals to the estimated sales returns and allowances accounts.
(4) Amounts in 2019 and 2018 are reported within accrued expenses and other current liabilities, as Product Returns Liability (see Note 4 and 9).
(5) Amounts in 2019 and 2018 are reported within prepaid expenses and other current assets.
Question:
What is the percentage change in the allowance for deferred tax assets at the end of period between 2018 and 2019?
Answer: (16.8 - 18.3)/18.3  = -8.2