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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
Dec. 31, 2017
Dec. 31, 2016
Assets, carrying amount    
Fixed-rate loans $ 3,793.8 $ 3,607.4
Liabilities, carrying amount    
Fixed-rate debt 5,397.6 4,915.2
Assets, Fair Value    
Fixed-rate loans 3,804.8 3,638.4
Liabilities, Fair Value    
Fixed-rate debt $ 5,387.0 $ 4,929.3