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Capital Stock, Accumulated Other Comprehensive Loss and Equity - Narrative (Details) | 3 Months Ended | 12 Months Ended | 120 Months Ended
--- | --- | --- | ---
Dec. 31, 2020 USD ($) vote $ / shares shares | Apr. 04, 2020 $ / shares | Dec. 31, 2020 USD ($) vote $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) vote $ / shares shares
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Common stock, shares authorized (in shares) | shares | 300,000,000 |  | 300,000,000 | 300,000,000 |  | 300,000,000
Common stock holders voting right, vote per outstanding share | vote | 1 |  | 1 |  |  | 1
Common stock, aggregate authorized repurchase amount | $ 6,100,000,000 |  | $ 6,100,000,000 |  |  | $ 6,100,000,000
Cash paid for Repurchases |  |  | $ 70,000,000.0 | $ 384,700,000 | $ 704,900,000 | $ 4,700,000,000
Repurchases of shares of common stock, average price (in dollars per share) | $ / shares |  |  | $ 109.22 | $ 134.95 | $ 163.69 | $ 90.07
Remaining repurchase authorization | $ 1,400,000,000 |  | $ 1,400,000,000 |  |  | $ 1,400,000,000
Retirement of shares held in treasury (in shares) | shares |  |  |  |  | 8,000,000 |
Increase (reduction) for retirement of shares held in treasury |  |  |  |  | $ 0 |
Cash dividends declared (in dollars per share) | $ / shares | $ 0.25 | $ 0.77 |  | $ 0.75 | $ 0.70 |
Pretax income (loss) related to intercompany transactions for which settlement is not planned or anticipated in the foreseeable future |  |  | (600,000) | $ (500,000) | $ (1,200,000) |
Derivatives net investment hedge foreign currency translation | $ (18,300,000) |  | $ (18,300,000) | $ (4,400,000) |  | $ (18,300,000)
Common Stock |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Increase (reduction) for retirement of shares held in treasury |  |  |  |  | 100,000 |
Additional Paid-in Capital |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Increase (reduction) for retirement of shares held in treasury |  |  |  |  | 155,900,000 |
Retained Earnings |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Increase (reduction) for retirement of shares held in treasury |  |  |  |  | 1,014,200,000 |
Treasury Stock |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Increase (reduction) for retirement of shares held in treasury |  |  |  |  | $ (1,170,200,000) |
Shanghai Lear STEC Automotive Parts Co., Ltd |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Ownership percentage by noncontrolling owners | 45.00% |  | 45.00% |  |  | 45.00%
Payments for repurchase of redeemable noncontrolling interest | $ 95,500,000 |  |  |  |  |
Retained earnings, undistributed earnings | $ 26,800,000 |  | $ 26,800,000 |  |  | $ 26,800,000

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