Supplemental Guarantor Financial Information (Condensed Consolidating Balance Sheets) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011
Supplemental Guarantor Financial Information [Line Items]
Cash and cash equivalents	$ 434.9	$ 535.7	$ 566.4	$ 591.7
Accounts and notes receivable, net	278.6	452.5	236.6
Inventories	926.5	908.3	730.2
Other current assets	83.0	85.4	131.3
Total current assets	1,723.0	1,981.9	1,664.5
Property, plant and equipment, net	220.6	239.0	260.5
Goodwill, net	38.5	36.6	40.3
Other assets, net	43.1	41.6	52.7
Total assets	2,025.2	2,299.1	2,018.0
Current maturities of long-term debt	212.8	278.7
Accounts payable	301.8	435.6	252.6
Accrued expenses and other current liabilities	229.7	263.9	237.7
Total current liabilities	744.3	978.2	490.3
Long-term debt, excluding current maturities	499.1	499.0	674.9
Other non-current liabilities	220.4	223.2	113.1
Total liabilities	1,463.8	1,700.4	1,278.3
Stockholders' equity	561.4	598.7	739.7
Total liabilities and stockholders' equity	2,025.2	2,299.1	2,018.0
RadioShack Corporation [Member]
Supplemental Guarantor Financial Information [Line Items]
Cash and cash equivalents	94.1	84.9	151.2	154.6
Accounts and notes receivable, net	258.4	381.0	197.1
Inventories	820.3	804.8	636.7
Other current assets	71.5	74.8	125.3
Total current assets	1,244.3	1,345.5	1,110.3
Property, plant and equipment, net	205.5	218.5	229.8
Goodwill, net			3.1
Other assets, net	29.4	30.7	40.9
Investment in subsidiaries	2,052.2	2,041.0	2,060.8
Total assets	3,531.4	3,635.7	3,444.9
Current maturities of long-term debt	212.8	278.7
Accounts payable	255.3	373.0	222.0
Accrued expenses and other current liabilities	192.2	217.6	186.4
Intercompany payables	169.3	141.7	206.9
Intercompany notes payable	1,467.8	1,354.5	1,330.3
Total current liabilities	2,297.4	2,365.5	1,945.6
Long-term debt, excluding current maturities	499.1	499.0	674.9
Other non-current liabilities	173.5	172.5	84.7
Total liabilities	2,970.0	3,037.0	2,705.2
Stockholders' equity	561.4	598.7	739.7
Total liabilities and stockholders' equity	3,531.4	3,635.7	3,444.9
Guarantor Subsidiaries [Member]
Supplemental Guarantor Financial Information [Line Items]
Cash and cash equivalents	317.8	430.5	395.5	404.9
Accounts and notes receivable, net	18.9	69.6	33.7
Inventories	66.8	62.7	65.3
Other current assets	4.8	4.2	1.0
Intercompany receivables	185.5	146.9	208.9
Intercompany notes receivable	1,467.8	1,354.5	1,330.3
Total current assets	2,061.6	2,068.4	2,034.7
Property, plant and equipment, net	0.9	6.3	21.8
Goodwill, net	0.5	0.5	0.5
Other assets, net	0.1	0.1	1.3
Investment in subsidiaries	85.2	77.8	77.0
Total assets	2,148.3	2,153.1	2,135.3
Accounts payable	31.3	36.5	16.4
Accrued expenses and other current liabilities	30.0	36.4	43.1
Total current liabilities	61.3	72.9	59.5
Other non-current liabilities	46.6	50.5	27.5
Total liabilities	107.9	123.4	87.0
Stockholders' equity	2,040.4	2,029.7	2,048.3
Total liabilities and stockholders' equity	2,148.3	2,153.1	2,135.3
Non-Guarantor Subsidiaries [Member]
Supplemental Guarantor Financial Information [Line Items]
Cash and cash equivalents	23.0	20.3	19.7	32.2
Accounts and notes receivable, net	1.3	1.9	5.8
Inventories	39.4	40.8	28.2
Other current assets	6.7	6.4	5.0
Total current assets	70.4	69.4	58.7
Property, plant and equipment, net	14.2	14.2	8.9
Goodwill, net	38.0	36.1	36.7
Other assets, net	13.6	10.8	10.5
Total assets	136.2	130.5	114.8
Accounts payable	15.2	26.1	14.2
Accrued expenses and other current liabilities	7.5	9.9	8.2
Intercompany payables	16.2	5.2	2.0
Total current liabilities	38.9	41.2	24.4
Other non-current liabilities	0.3	0.2	0.9
Total liabilities	39.2	41.4	25.3
Stockholders' equity	97.0	89.1	89.5
Total liabilities and stockholders' equity	136.2	130.5	114.8
Eliminations [Member]
Supplemental Guarantor Financial Information [Line Items]
Cash and cash equivalents
Intercompany receivables	(185.5)	(146.9)	(208.9)
Intercompany notes receivable	(1,467.8)	(1,354.5)	(1,330.3)
Total current assets	(1,653.3)	(1,501.4)	(1,539.2)
Investment in subsidiaries	(2,137.4)	(2,118.8)	(2,137.8)
Total assets	(3,790.7)	(3,620.2)	(3,677.0)
Intercompany payables	(185.5)	(146.9)	(208.9)
Intercompany notes payable	(1,467.8)	(1,354.5)	(1,330.3)
Total current liabilities	(1,653.3)	(1,501.4)	(1,539.2)
Total liabilities	(1,653.3)	(1,501.4)	(1,539.2)
Stockholders' equity	(2,137.4)	(2,118.8)	(2,137.8)
Total liabilities and stockholders' equity	$ (3,790.7)	$ (3,620.2)	$ (3,677.0)