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SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Allowance for Doubtful Accounts [Member] |  |  |  |  |  |
Allowance for sales returns and doubtful accounts [Roll Forward] |  |  |  |  |  |
Balance at Beginning of Period | $ 5.8 us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember |  | $ 6.3 us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember |  | $ 5.4 us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember |
Charged to Expenses | 8.9 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember |  | 4.0 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember |  | 5.0 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember |
Write-offs | (8.3)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember |  | (4.5)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember |  | (4.1)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember |
Other | 0.1 us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember | [1] | 0 us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember |  | 0 us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember |
Balance at End of Period | 6.5 us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember |  | 5.8 us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember |  | 6.3 us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember |
Allowance for Sales Returns [Member] |  |  |  |  |  |
Allowance for sales returns and doubtful accounts [Roll Forward] |  |  |  |  |  |
Balance at Beginning of Period | 10.9 us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForSalesReturnsMember |  | 9.2 us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForSalesReturnsMember |  | 9.3 us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForSalesReturnsMember |
Charged to Expenses | 9.3 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForSalesReturnsMember |  | 10.9 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForSalesReturnsMember |  | 9.2 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForSalesReturnsMember |
Write-offs | 0 us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForSalesReturnsMember |  | 0 us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForSalesReturnsMember |  | 0 us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForSalesReturnsMember |
Other | (10.9)us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForSalesReturnsMember | [2] | (9.2)us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForSalesReturnsMember | [2] | (9.3)us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForSalesReturnsMember | [2]
Balance at End of Period | 9.3 us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForSalesReturnsMember |  | 10.9 us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForSalesReturnsMember |  | 9.2 us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForSalesReturnsMember |
Allowance for Inventory Returns [Member] |  |  |  |  |  |
Allowance for sales returns and doubtful accounts [Roll Forward] |  |  |  |  |  |
Balance at Beginning of Period | (9.2)us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_ValuationAllowancesAndReservesTypeAxis = syx_AllowanceForInventoryReturnsMember |  | (8.0)us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_ValuationAllowancesAndReservesTypeAxis = syx_AllowanceForInventoryReturnsMember |  | (7.9)us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_ValuationAllowancesAndReservesTypeAxis = syx_AllowanceForInventoryReturnsMember |
Charged to Expenses | (7.8)us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = syx_AllowanceForInventoryReturnsMember |  | (9.2)us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = syx_AllowanceForInventoryReturnsMember |  | (8.0)us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = syx_AllowanceForInventoryReturnsMember |
Write-offs | 0 us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs / us-gaap_ValuationAllowancesAndReservesTypeAxis = syx_AllowanceForInventoryReturnsMember |  | 0 us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs / us-gaap_ValuationAllowancesAndReservesTypeAxis = syx_AllowanceForInventoryReturnsMember |  | 0 us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs / us-gaap_ValuationAllowancesAndReservesTypeAxis = syx_AllowanceForInventoryReturnsMember |
Other | 9.2 us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts / us-gaap_ValuationAllowancesAndReservesTypeAxis = syx_AllowanceForInventoryReturnsMember | [2] | 8.0 us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts / us-gaap_ValuationAllowancesAndReservesTypeAxis = syx_AllowanceForInventoryReturnsMember | [2] | 7.9 us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts / us-gaap_ValuationAllowancesAndReservesTypeAxis = syx_AllowanceForInventoryReturnsMember | [2]
Balance at End of Period | (7.8)us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_ValuationAllowancesAndReservesTypeAxis = syx_AllowanceForInventoryReturnsMember |  | (9.2)us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_ValuationAllowancesAndReservesTypeAxis = syx_AllowanceForInventoryReturnsMember |  | (8.0)us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_ValuationAllowancesAndReservesTypeAxis = syx_AllowanceForInventoryReturnsMember |
Allowance for Deferred Tax Assets, Current [Member] |  |  |  |  |  |
Allowance for sales returns and doubtful accounts [Roll Forward] |  |  |  |  |  |
Balance at Beginning of Period | 11.2 us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_ValuationAllowancesAndReservesTypeAxis = syx_AllowanceForDeferredTaxAssetsCurrentMember |  | 2.2 us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_ValuationAllowancesAndReservesTypeAxis = syx_AllowanceForDeferredTaxAssetsCurrentMember |  | 1.5 us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_ValuationAllowancesAndReservesTypeAxis = syx_AllowanceForDeferredTaxAssetsCurrentMember |
Charged to Expenses | (0.7)us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = syx_AllowanceForDeferredTaxAssetsCurrentMember |  | 9.0 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = syx_AllowanceForDeferredTaxAssetsCurrentMember |  | 0.7 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = syx_AllowanceForDeferredTaxAssetsCurrentMember |
Write-offs | 0 us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs / us-gaap_ValuationAllowancesAndReservesTypeAxis = syx_AllowanceForDeferredTaxAssetsCurrentMember |  | 0 us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs / us-gaap_ValuationAllowancesAndReservesTypeAxis = syx_AllowanceForDeferredTaxAssetsCurrentMember |  | 0 us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs / us-gaap_ValuationAllowancesAndReservesTypeAxis = syx_AllowanceForDeferredTaxAssetsCurrentMember |
Other | 0 us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts / us-gaap_ValuationAllowancesAndReservesTypeAxis = syx_AllowanceForDeferredTaxAssetsCurrentMember |  | 0 us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts / us-gaap_ValuationAllowancesAndReservesTypeAxis = syx_AllowanceForDeferredTaxAssetsCurrentMember |  | 0 us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts / us-gaap_ValuationAllowancesAndReservesTypeAxis = syx_AllowanceForDeferredTaxAssetsCurrentMember |
Balance at End of Period | 10.5 us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_ValuationAllowancesAndReservesTypeAxis = syx_AllowanceForDeferredTaxAssetsCurrentMember |  | 11.2 us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_ValuationAllowancesAndReservesTypeAxis = syx_AllowanceForDeferredTaxAssetsCurrentMember |  | 2.2 us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_ValuationAllowancesAndReservesTypeAxis = syx_AllowanceForDeferredTaxAssetsCurrentMember |
Allowance for Deferred Tax Assets, Noncurrent [Member] |  |  |  |  |  |
Allowance for sales returns and doubtful accounts [Roll Forward] |  |  |  |  |  |
Balance at Beginning of Period | 28.5 us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_ValuationAllowancesAndReservesTypeAxis = syx_AllowanceForDeferredTaxAssetsNoncurrentMember |  | 8.9 us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_ValuationAllowancesAndReservesTypeAxis = syx_AllowanceForDeferredTaxAssetsNoncurrentMember |  | 28.4 us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_ValuationAllowancesAndReservesTypeAxis = syx_AllowanceForDeferredTaxAssetsNoncurrentMember |
Charged to Expenses | 9.8 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = syx_AllowanceForDeferredTaxAssetsNoncurrentMember |  | 19.6 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = syx_AllowanceForDeferredTaxAssetsNoncurrentMember |  | (19.5)us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = syx_AllowanceForDeferredTaxAssetsNoncurrentMember |
Write-offs | 0 us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs / us-gaap_ValuationAllowancesAndReservesTypeAxis = syx_AllowanceForDeferredTaxAssetsNoncurrentMember |  | 0 us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs / us-gaap_ValuationAllowancesAndReservesTypeAxis = syx_AllowanceForDeferredTaxAssetsNoncurrentMember |  | 0 us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs / us-gaap_ValuationAllowancesAndReservesTypeAxis = syx_AllowanceForDeferredTaxAssetsNoncurrentMember |
Other | 0 us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts / us-gaap_ValuationAllowancesAndReservesTypeAxis = syx_AllowanceForDeferredTaxAssetsNoncurrentMember |  | 0 us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts / us-gaap_ValuationAllowancesAndReservesTypeAxis = syx_AllowanceForDeferredTaxAssetsNoncurrentMember |  | 0 us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts / us-gaap_ValuationAllowancesAndReservesTypeAxis = syx_AllowanceForDeferredTaxAssetsNoncurrentMember |
Balance at End of Period | $ 38.3 us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_ValuationAllowancesAndReservesTypeAxis = syx_AllowanceForDeferredTaxAssetsNoncurrentMember |  | $ 28.5 us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_ValuationAllowancesAndReservesTypeAxis = syx_AllowanceForDeferredTaxAssetsNoncurrentMember |  | $ 8.9 us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_ValuationAllowancesAndReservesTypeAxis = syx_AllowanceForDeferredTaxAssetsNoncurrentMember |
[1] | Other relates to SCC Netherlands BV acquisition allowance for doubtful accounts as of acquisition date.
[2] | Amounts represent gross revenue and cost reversals to the estimated sales returns and allowances accounts.

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