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MORTGAGE DEBT AND BANK LOANS (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Mortgage Debt And Bank Loans [Line Items]      
Mortgage debt and bank loans $ 733.9 $ 725.8 $ 746.3
Falling due within one year      
Mortgage Debt And Bank Loans [Line Items]      
Mortgage debt and bank loans 95.3 92.7 82.3
Falling due between one and two years      
Mortgage Debt And Bank Loans [Line Items]      
Mortgage debt and bank loans 86.8 86.7 138.8
Falling due between two and three years      
Mortgage Debt And Bank Loans [Line Items]      
Mortgage debt and bank loans 291.3 82.2 72.2
Falling due between three and four years      
Mortgage Debt And Bank Loans [Line Items]      
Mortgage debt and bank loans 155.3 346.7 283.5
Falling due between four and five years      
Mortgage Debt And Bank Loans [Line Items]      
Mortgage debt and bank loans 23.1 89.2 119.1
Falling due after five years      
Mortgage Debt And Bank Loans [Line Items]      
Mortgage debt and bank loans $ 82.1 $ 28.3 $ 50.4