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Income Taxes (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 02, 2016 | Jun. 27, 2015 | Jul. 02, 2016 | Jun. 27, 2015
Income Tax Contingency [Line Items] |  |  |  |
Provision for income taxes | $ 101.0 | $ 71.9 | $ 199.2 | $ 134.8
Pretax income before equity in net income of affiliates | $ 376.0 | $ 256.3 | $ 719.9 | $ 462.6
Effective tax rate | 26.90% | 28.10% | 27.70% | 29.10%
Tax benefits |  |  | $ 12.1 | $ 29.8
U.S. federal statutory income tax rate |  |  | 35.00% | 35.00%
Beijing BAI Lear Automotive Systems Co., Ltd. |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Gain on consolidation of affiliate | $ 30.3 |  | $ 30.3 |

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