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Summary of Significant Accounting Policies - Summary of Other (Income) Expense, Net (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Other Income and Expenses [Abstract]      
Other expense $ 82.4us-gaap_OtherExpenses $ 59.9us-gaap_OtherExpenses $ 33.9us-gaap_OtherExpenses
Other income (8.1)us-gaap_OtherIncome (1.8)us-gaap_OtherIncome (27.5)us-gaap_OtherIncome
Other expense, net $ 74.3lea_OtherIncomeExpenseNet $ 58.1lea_OtherIncomeExpenseNet $ 6.4lea_OtherIncomeExpenseNet