Supplemental Guarantor Financial Information (Condensed Consolidating Balance Sheets) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011
Supplemental Guarantor Financial Information [Line Items]
Cash and cash equivalents	$ 316.4	$ 535.7	$ 546.1	$ 591.7
Accounts and notes receivable, net	201.6	452.5	349.2
Inventories	707.7	908.3	851.1
Other current assets	105.2	85.4	174.0
Total current assets	1,330.9	1,981.9	1,920.4
Property, plant and equipment, net	203.2	239.0	241.0
Goodwill, net	36.1	36.6	36.9
Other assets, net	36.9	41.6	39.0
Total assets	1,607.1	2,299.1	2,237.3
Current maturities of long-term debt	1.0	278.7	275.2
Accounts payable	282.1	435.6	386.2
Accrued expenses and other current liabilities	217.4	263.9	261.3
Total current liabilities	500.5	978.2	922.7
Long-term debt, excluding current maturities	498.3	499.0	474.0
Other non-current liabilities	214.3	223.2	178.2
Total liabilities	1,213.1	1,700.4	1,574.9
Stockholders' equity	394.0	598.7	662.4
Total liabilities and stockholders' equity	1,607.1	2,299.1	2,237.3
RadioShack Corporation [Member]
Supplemental Guarantor Financial Information [Line Items]
Cash and cash equivalents	86.8	84.9	159.1	154.6
Accounts and notes receivable, net	198.7	381.0	313.3
Inventories	654.8	804.8	752.7
Other current assets	93.7	74.8	166.5
Total current assets	1,034.0	1,345.5	1,391.6
Property, plant and equipment, net	190.0	218.5	223.3
Other assets, net	23.6	30.7	28.4
Investment in subsidiaries	2,064.8	2,041.0	2,095.2
Total assets	3,312.4	3,635.7	3,738.5
Current maturities of long-term debt	1.0	278.7	275.2
Accounts payable	216.6	373.0	317.7
Accrued expenses and other current liabilities	185.0	217.6	205.4
Intercompany payables	257.7	141.7	256.8
Intercompany notes payable	1,586.9	1,354.5	1,415.3
Total current liabilities	2,247.2	2,365.5	2,470.4
Long-term debt, excluding current maturities	498.3	499.0	474.0
Other non-current liabilities	172.9	172.5	131.7
Total liabilities	2,918.4	3,037.0	3,076.1
Stockholders' equity	394.0	598.7	662.4
Total liabilities and stockholders' equity	3,312.4	3,635.7	3,738.5
Guarantor Subsidiaries [Member]
Supplemental Guarantor Financial Information [Line Items]
Cash and cash equivalents	209.3	430.5	369.3	404.9
Accounts and notes receivable, net		69.6	31.0
Inventories	22.4	62.7	55.8
Other current assets	5.0	4.2	0.9
Intercompany receivables	275.6	146.9	270.6
Intercompany notes receivable	1,586.9	1,354.5	1,415.3
Total current assets	2,099.2	2,068.4	2,142.9
Property, plant and equipment, net	0.8	6.3	7.4
Goodwill, net	0.6	0.5	0.5
Other assets, net		0.1	0.1
Investment in subsidiaries	69.5	77.8	77.4
Total assets	2,170.1	2,153.1	2,228.3
Accounts payable	48.6	36.5	50.5
Accrued expenses and other current liabilities	25.8	36.4	47.3
Total current liabilities	74.4	72.9	97.8
Other non-current liabilities	41.4	50.5	45.8
Total liabilities	115.8	123.4	143.6
Stockholders' equity	2,054.3	2,029.7	2,084.7
Total liabilities and stockholders' equity	2,170.1	2,153.1	2,228.3
Non-Guarantor Subsidiaries [Member]
Supplemental Guarantor Financial Information [Line Items]
Cash and cash equivalents	20.3	20.3	17.7	32.2
Accounts and notes receivable, net	2.9	1.9	4.9
Inventories	30.5	40.8	42.6
Other current assets	6.5	6.4	6.6
Total current assets	60.2	69.4	71.8
Property, plant and equipment, net	12.4	14.2	10.3
Goodwill, net	35.5	36.1	36.4
Other assets, net	13.3	10.8	10.5
Total assets	121.4	130.5	129.0
Accounts payable	16.9	26.1	18.0
Accrued expenses and other current liabilities	6.6	9.9	8.6
Intercompany payables	17.9	5.2	13.8
Total current liabilities	41.4	41.2	40.4
Other non-current liabilities		0.2	0.7
Total liabilities	41.4	41.4	41.1
Stockholders' equity	80.0	89.1	87.9
Total liabilities and stockholders' equity	121.4	130.5	129.0
Eliminations [Member]
Supplemental Guarantor Financial Information [Line Items]
Cash and cash equivalents
Intercompany receivables	(275.6)	(146.9)	(270.6)
Intercompany notes receivable	(1,586.9)	(1,354.5)	(1,415.3)
Total current assets	(1,862.5)	(1,501.4)	(1,685.9)
Investment in subsidiaries	(2,134.3)	(2,118.8)	(2,172.6)
Total assets	(3,996.8)	(3,620.2)	(3,858.5)
Intercompany payables	(275.6)	(146.9)	(270.6)
Intercompany notes payable	(1,586.9)	(1,354.5)	(1,415.3)
Total current liabilities	(1,862.5)	(1,501.4)	(1,685.9)
Total liabilities	(1,862.5)	(1,501.4)	(1,685.9)
Stockholders' equity	(2,134.3)	(2,118.8)	(2,172.6)
Total liabilities and stockholders' equity	$ (3,996.8)	$ (3,620.2)	$ (3,858.5)