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Responsibilities and Commitments - Summary of Other Provisions, Contingent Liabilities and Other Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of finance lease and operating lease by lessee [abstract]    
Maximum financial guarantees $ 66.6 $ 107.7
Maximum residual value guarantees 253.1 267.4
Mutually exclusive exposure (26.9) (29.0)
Provisions and liabilities recorded (137.0) (126.0)
Off-balance sheet exposure 155.8 220.1
Estimated proceeds from financial guarantees and underlying assets $ 177.6 $ 266.9