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Carrying Amount and Fair Value of Financial Services Fixed-Rate Loans and Fixed-Rate Debt (Detail) - Financial Services - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Assets, carrying amount    
Fixed-rate loans $ 4,207.5 $ 3,793.8
Liabilities, carrying amount    
Fixed-rate debt 5,455.3 5,397.6
Assets, Fair Value    
Fixed-rate loans 4,195.4 3,804.8
Liabilities, Fair Value    
Fixed-rate debt $ 5,398.6 $ 5,387.0