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Net investment in lease - Schedule of Minimum Lease Receivable from Direct Financing Leases (Detail) - Seaspan [Member] - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Leases [Line Items]    
2020 $ 95.7  
2021 95.4  
2022 95.4  
2023 297.5  
2024 44.5  
Thereafter 595.7  
Minimum lease receivable from direct financing leases $ 1,224.2 $ 861.9