Supplemental Guarantor Financial Information (Condensed Consolidating Statements Of Cash Flows) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Supplemental Guarantor Financial Information [Line Items]
Net cash provided by (used in) operating activities	$ (43.0)	$ 217.9	$ 155.0
Additions to property, plant and equipment	(67.8)	(82.1)	(80.1)
Changes in restricted cash (See Note 2)	(26.5)
Other investing activities	0.1	2.0	0.1
Net cash used in investing activities	(94.2)	(80.1)	(80.0)
Net proceeds from issuance of long-term debt	175.0	322.5
Payments of debt issuance costs	(7.3)	(7.1)
Principal amount of long-term debt repayments	(88.1)	(306.8)
Purchases of treasury stock		(113.3)	(398.8)
Payments of dividends	(24.9)	(49.6)	(26.5)
Changes in cash overdrafts	26.5	32.8	7.5
Proceeds from exercise of stock options		6.0	4.0
Net cash provided by (used in) financing activities	81.2	(115.5)	(413.8)
Net increase (decrease) in cash and cash equivalents	(56.0)	22.3	(338.8)
Cash and cash equivalents, beginning of period	591.7	569.4	908.2
Cash and cash equivalents, end of period	535.7	591.7	569.4
RadioShack Corporation (Parent Co.) [Member]
Supplemental Guarantor Financial Information [Line Items]
Net cash provided by (used in) operating activities	(68.0)	93.7	45.9
Additions to property, plant and equipment	(58.7)	(64.2)	(65.0)
Changes in restricted cash (See Note 2)	(26.5)
Dividends received from subsidiary	2.1	1.5	1.7
Other investing activities	0.1	2.0	0.1
Net cash used in investing activities	(83.0)	(60.7)	(63.2)
Net proceeds from issuance of long-term debt	175.0	322.5
Payments of debt issuance costs	(7.3)	(7.1)
Principal amount of long-term debt repayments	(88.1)	(306.8)
Purchases of treasury stock		(113.3)	(398.8)
Payments of dividends	(24.9)	(49.6)	(26.5)
Changes in cash overdrafts	26.5	32.8	7.5
Proceeds from exercise of stock options		6.0	4.0
Change in intercompany receivable/payable	0.1	127.4	463.0
Net cash provided by (used in) financing activities	81.3	11.9	49.2
Net increase (decrease) in cash and cash equivalents	(69.7)	44.9	31.9
Cash and cash equivalents, beginning of period	154.6	109.7	77.8
Cash and cash equivalents, end of period	84.9	154.6	109.7
Guarantor Subsidiaries [Member]
Supplemental Guarantor Financial Information [Line Items]
Net cash provided by (used in) operating activities	27.9	134.0	100.1
Additions to property, plant and equipment	(1.4)	(14.8)	(12.5)
Net cash used in investing activities	(1.4)	(14.8)	(12.5)
Change in intercompany receivable/payable	(0.9)	(141.7)	(462.2)
Net cash provided by (used in) financing activities	(0.9)	(141.7)	(462.2)
Net increase (decrease) in cash and cash equivalents	25.6	(22.5)	(374.6)
Cash and cash equivalents, beginning of period	404.9	427.4	802.0
Cash and cash equivalents, end of period	430.5	404.9	427.4
Non-Guarantor Subsidiaries [Member]
Supplemental Guarantor Financial Information [Line Items]
Net cash provided by (used in) operating activities	(2.9)	(9.8)	9.0
Additions to property, plant and equipment	(7.7)	(3.1)	(2.6)
Net cash used in investing activities	(7.7)	(3.1)	(2.6)
Payments of dividends	(2.1)	(1.5)	(1.7)
Change in intercompany receivable/payable	0.8	14.3	(0.8)
Net cash provided by (used in) financing activities	(1.3)	12.8	(2.5)
Net increase (decrease) in cash and cash equivalents	(11.9)	(0.1)	3.9
Cash and cash equivalents, beginning of period	32.2	32.3	28.4
Cash and cash equivalents, end of period	20.3	32.2	32.3
Eliminations [Member]
Supplemental Guarantor Financial Information [Line Items]
Dividends received from subsidiary	(2.1)	(1.5)	(1.7)
Net cash used in investing activities	(2.1)	(1.5)	(1.7)
Payments of dividends	2.1	1.5	1.7
Net cash provided by (used in) financing activities	$ 2.1	$ 1.5	$ 1.7