Supplemental Guarantor Financial Information (Condensed Consolidating Balance Sheets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Supplemental Guarantor Financial Information [Line Items]
Cash and cash equivalents	$ 535.7	$ 591.7	$ 569.4	$ 908.2
Accounts and notes receivable, net	452.5	360.6
Inventories	908.3	744.4
Other current assets	85.4	116.1
Total current assets	1,981.9	1,812.8
Property, plant and equipment, net	239.0	270.2
Goodwill, net	36.6	37.0	41.2
Other assets, net	41.6	55.1
Total assets	2,299.1	2,175.1
Current maturities of long-term debt	278.7
Accounts payable	435.6	348.2
Accrued expenses and other current liabilities	263.9	287.9
Total current liabilities	978.2	636.1
Long-term debt, excluding current maturities	499.0	670.6
Other non-current liabilities	223.2	115.1
Total liabilities	1,700.4	1,421.8
Stockholders' equity	598.7	753.3	842.5
Total liabilities and stockholders' equity	2,299.1	2,175.1
RadioShack Corporation (Parent Co.) [Member]
Supplemental Guarantor Financial Information [Line Items]
Cash and cash equivalents	84.9	154.6	109.7	77.8
Accounts and notes receivable, net	381.0	294.1
Inventories	804.8	658.8
Other current assets	74.8	110.7
Total current assets	1,345.5	1,218.2
Property, plant and equipment, net	218.5	238.9
Goodwill, net		3.0
Other assets, net	30.7	43.6
Investment in subsidiaries	2,041.0	2,033.0
Total assets	3,635.7	3,536.7
Current maturities of long-term debt	278.7
Accounts payable	373.0	292.9
Accrued expenses and other current liabilities	217.6	236.8
Intercompany payables	141.7	175.4
Intercompany notes payable	1,354.5	1,320.7
Total current liabilities	2,365.5	2,025.8
Long-term debt, excluding current maturities	499.0	670.6
Other non-current liabilities	172.5	87.0
Total liabilities	3,037.0	2,783.4
Stockholders' equity	598.7	753.3
Total liabilities and stockholders' equity	3,635.7	3,536.7
Guarantor Subsidiaries [Member]
Supplemental Guarantor Financial Information [Line Items]
Cash and cash equivalents	430.5	404.9	427.4	802.0
Accounts and notes receivable, net	69.6	60.1
Inventories	62.7	57.4
Other current assets	4.2	0.8
Intercompany receivables	146.9	179.8
Intercompany notes receivable	1,354.5	1,320.7
Total current assets	2,068.4	2,023.7
Property, plant and equipment, net	6.3	22.7
Goodwill, net	0.5	0.5
Other assets, net	0.1	1.1
Investment in subsidiaries	77.8	70.1
Total assets	2,153.1	2,118.1
Accounts payable	36.5	26.4
Accrued expenses and other current liabilities	36.4	43.3
Total current liabilities	72.9	69.7
Other non-current liabilities	50.5	27.1
Total liabilities	123.4	96.8
Stockholders' equity	2,029.7	2,021.3
Total liabilities and stockholders' equity	2,153.1	2,118.1
Non-Guarantor Subsidiaries [Member]
Supplemental Guarantor Financial Information [Line Items]
Cash and cash equivalents	20.3	32.2	32.3	28.4
Accounts and notes receivable, net	1.9	6.4
Inventories	40.8	28.2
Other current assets	6.4	4.6
Total current assets	69.4	71.4
Property, plant and equipment, net	14.2	8.6
Goodwill, net	36.1	33.5
Other assets, net	10.8	10.4
Total assets	130.5	123.9
Accounts payable	26.1	28.9
Accrued expenses and other current liabilities	9.9	7.8
Intercompany payables	5.2	4.4
Total current liabilities	41.2	41.1
Other non-current liabilities	0.2	1.0
Total liabilities	41.4	42.1
Stockholders' equity	89.1	81.8
Total liabilities and stockholders' equity	130.5	123.9
Eliminations [Member]
Supplemental Guarantor Financial Information [Line Items]
Intercompany receivables	(146.9)	(179.8)
Intercompany notes receivable	(1,354.5)	(1,320.7)
Total current assets	(1,501.4)	(1,500.5)
Investment in subsidiaries	(2,118.8)	(2,103.1)
Total assets	(3,620.2)	(3,603.6)
Intercompany payables	(146.9)	(179.8)
Intercompany notes payable	(1,354.5)	(1,320.7)
Total current liabilities	(1,501.4)	(1,500.5)
Total liabilities	(1,501.4)	(1,500.5)
Stockholders' equity	(2,118.8)	(2,103.1)
Total liabilities and stockholders' equity	$ (3,620.2)	$ (3,603.6)