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Related Party Transactions and Balances - Additional Information - Senior Unsecured Bonds (Details) - USD ($)
1 Months Ended
Jul. 02, 2018
Jul. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Sep. 25, 2017
Jul. 01, 2016
Related Party Transaction [Line Items]            
Due to affiliates (notes 11f and 11l)     $ 0 $ 163,037,000    
Long-term debt     2,543,406,000 $ 2,533,961,000    
Brookfield | Brookfield Promissory Note            
Related Party Transaction [Line Items]            
Early termination fee     12,000,000      
Bonds | Five-Year Senior Unsecured Bonds Maturing July 2023            
Related Party Transaction [Line Items]            
Debt instrument, face amount $ 700,000,000.0 $ 700,000,000        
Debt instrument term (in years) 5 years 5 years        
Interest rate, percentage 8.50% 8.50%        
Subordinated debt | Brookfield Promissory Note            
Related Party Transaction [Line Items]            
Debt instrument, face amount         $ 200,000,000  
Interest rate, percentage         10.00%  
Due to affiliates (notes 11f and 11l)     168,500,000   $ 200,000,000 $ 200,000,000
Brookfield | Bonds | Five-Year Senior Unsecured Bonds Maturing July 2023            
Related Party Transaction [Line Items]            
Debt instrument, face amount $ 500,000,000          
Long-term debt     $ 475,000,000