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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Allowance for sales returns and doubtful accounts [Roll Forward] |  |  |
Reserves related to non trade receivables | $ 0.4 |  |
Reserves related to notes receivable and tax refund receivables |  | $ 5.6 |
Allowance for doubtful accounts |  |  |
Allowance for sales returns and doubtful accounts [Roll Forward] |  |  |
Balance at Beginning of Period | 10.0 | 7.2 | $ 3.7
Charged to Expenses | 1.3 | 3.6 | 6.7
Write-offs | (9.2) | (0.8) | (3.4)
Other | 0.0 | 0.0 | 0.2
Balance at End of Period | 2.1 | 10.0 | 7.2
Allowance for sales returns |  |  |
Allowance for sales returns and doubtful accounts [Roll Forward] |  |  |
Balance at Beginning of Period | 1.6 | 3.5 | 7.8
Charged to Expenses | 1.8 | 1.6 | 3.5
Write-offs | 0.0 | 0.0 | 0.0
Other | (1.6) | (3.5) | (7.8)
Balance at End of Period | 1.8 | 1.6 | 3.5
Allowance for inventory returns |  |  |
Allowance for sales returns and doubtful accounts [Roll Forward] |  |  |
Balance at Beginning of Period | (0.8) | (2.7) | (6.4)
Charged to Expenses | (0.9) | (0.8) | (2.7)
Write-offs | 0.0 | 0.0 | 0.0
Other | 0.8 | 2.7 | 6.4
Balance at End of Period | (0.9) | (0.8) | (2.7)
Allowance for deferred tax assets |  |  |
Allowance for sales returns and doubtful accounts [Roll Forward] |  |  |
Balance at Beginning of Period | 69.7 | 64.0 | 35.8
Charged to Expenses | (28.6) | 6.0 | 28.6
Write-offs | (3.0) | (1.9) | 0.0
Other | (19.2) | 1.6 | (0.4)
Balance at End of Period | $ 18.9 | $ 69.7 | $ 64.0

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- Definition Amount of allowances and reserves related to notes receivable and tax refund receivables. + References No definition available. + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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