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Long-term Debt - Schedule of Future Minimum Repayments of Revolving Credit Facilities and Term Loans (Detail) - Seaspan [Member] - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Long-term debt $ 3,060.6 $ 3,487.5
Term Loans [Member]    
Debt Instrument [Line Items]    
2020 168.4  
2021 252.5  
2022 154.3  
2023 243.4  
2024 840.0  
Thereafter 140.8  
Long-term debt 1,799.4  
Revolving Credit Facilities [Member]    
Debt Instrument [Line Items]    
2020 197.9  
2021 50.7  
2022 387.4  
2023 72.6  
2024 158.4  
Thereafter 0.0  
Long-term debt $ 867.0