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MORTGAGE DEBT AND BANK LOANS (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Mortgage Debt And Bank Loans [Line Items]      
Mortgage debt and bank loans $ 696.4 $ 729.5 $ 730.9
Falling due within one year      
Mortgage Debt And Bank Loans [Line Items]      
Mortgage debt and bank loans 87.1 92.2 90.4
Falling due between one and two years      
Mortgage Debt And Bank Loans [Line Items]      
Mortgage debt and bank loans 87.1 87.6 86.0
Falling due between two and three years      
Mortgage Debt And Bank Loans [Line Items]      
Mortgage debt and bank loans 374.2 343.4 86.0
Falling due between three and four years      
Mortgage Debt And Bank Loans [Line Items]      
Mortgage debt and bank loans 26.9 96.9 381.9
Falling due between four and five years      
Mortgage Debt And Bank Loans [Line Items]      
Mortgage debt and bank loans 11.3 10.0 21.8
Falling due after five years      
Mortgage Debt And Bank Loans [Line Items]      
Mortgage debt and bank loans $ 109.8 $ 99.4 $ 64.8