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Comprehensive Income and Equity - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 0 Months Ended | 3 Months Ended | 6 Months Ended | 42 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2014 | Apr. 25, 2013 | Jun. 28, 2014 | Jun. 29, 2013 | Jun. 28, 2014 | Jun. 29, 2013 | Jun. 28, 2014
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Defined benefit plan adjustments, pension and other postretirement benefit plans |  |  | $ 0.1 | $ 2.6 | $ 0.1 | $ 5.2 |
Derivative instruments and hedging activities, reclassified from accumulated other comprehensive income (loss) |  |  | (3.5) | 10.6 | (4.5) | 18.8 |
Accelerated stock repurchase agreement amount |  | 800 |  |  |  |  |
Amount paid in accelerated stock repurchase agreement |  |  | 855.5 | 800.0 | 855.5 | 800.0 | 855.5
Common stock, repurchased |  |  |  |  | 1,152,832 |  |
Percentage of treasury stock repurchased |  |  |  | 80.00% |  |  |
Value of common stock repurchased, per share |  |  |  | $ 53.95 |  |  |
Common stock, additional shares repurchased | 658,903 |  |  |  |  |  |
Additional amount paid in accelerated stock repurchase agreement |  |  | 55.5 |  | 55.5 |  |
Value of common stock repurchased, average price per share |  |  | $ 72.11 |  |  |  |
Common stock, share repurchase program amount |  |  |  |  | 594.0 |  |
Common stock repurchased, average price per share |  |  |  |  | $ 87.16 |  |
Payments for repurchases of outstanding common stock |  |  |  |  | 156.0 | 1,000.1 | 1,700.0
Cash dividends declared per share |  |  |  |  | $ 0.20 | $ 0.17 |
Dividends declared to Lear Corporation stockholders |  |  | 16.7 | 14.1 | 33.9 | 30.6 |
Dividends paid to Lear Corporation stockholders |  |  |  |  | 33.6 | 29.6 |
Open Market Repurchases |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Payments for repurchases of outstanding common stock |  |  |  |  | $ 100.5 |  |
Accelerated Share Repurchase Agreement |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Common stock, repurchased |  |  |  | 11,862,836 |  |  |

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- Definition The adjustment needed to reconcile previously recorded amounts to the actual aggregate amount paid, whether in cash or other consideration, to acquire all of the shares purchased under an Accelerated Share Repurchase arrangement. + References No definition available. + Details
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- Definition Final price paid per share for the purchase of the targeted number of shares, determined by an average market price over a fixed period of time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653 + Details
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- Definition Amount before tax of reclassification adjustment from accumulated other comprehensive income (loss) for actuarial gain (loss) related to pension and other postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e689-108580 + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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