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Collateralized Accounts Receivable and Recourse and Non-Recourse Debt - Summary of Amounts Classified as Non-Current Assets (Detail)
$ in Millions
Dec. 31, 2018
USD ($)
Disclosure of fair value measurement [line items]  
Maturities of the amounts classified as non-current assets $ 17.4
2019 [member]  
Disclosure of fair value measurement [line items]  
Maturities of the amounts classified as non-current assets 3.7
2020 [member]  
Disclosure of fair value measurement [line items]  
Maturities of the amounts classified as non-current assets 3.9
2021 [member]  
Disclosure of fair value measurement [line items]  
Maturities of the amounts classified as non-current assets 4.0
2022 [member]  
Disclosure of fair value measurement [line items]  
Maturities of the amounts classified as non-current assets 2.6
Thereafter 2022 [member]  
Disclosure of fair value measurement [line items]  
Maturities of the amounts classified as non-current assets $ 3.2