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LONG-TERM DEBT (Schedule of Long-Term Debt) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Oct. 31, 2015
Dec. 31, 2014
Dec. 04, 2014
Debt Instrument [Line Items]          
Finance Lease, Liability $ 17.2 $ 3.1      
Total debt outstanding 943.3 910.1      
Add: unamortized premium on 6.0% Senior Subordinated Notes due 2024 5.1 6.0      
Less: debt issuance costs (9.0) (10.8)      
Long-term debt, including current portion 939.4 905.3      
Less—current portion, net of debt issuance costs (32.4) (38.8)      
Long-term debt 907.0 866.5      
Mortgages          
Debt Instrument [Line Items]          
Long-term debt, gross $ 100.5 $ 132.2      
Weighted average interest rate 5.30% 5.20%      
6.0% Senior Subordinated Notes due 2024 | Senior Subordinated Notes          
Debt Instrument [Line Items]          
Long-term debt, gross $ 600.0 $ 600.0      
Less: debt issuance costs     $ (3.8)    
Stated interest rate of debt instrument 6.00%   6.00% 6.00% 6.00%
2018 BofA Real Estate Facility          
Debt Instrument [Line Items]          
Mortgage note payable classified as Liabilities Associated with Assets Held for Sale $ 26.6        
2018 Wells Fargo Master Loan Facility          
Debt Instrument [Line Items]          
Long-term debt, gross   $ 25.0      
2015 Wells Fargo Master Loan Facility          
Debt Instrument [Line Items]          
Mortgage note payable classified as Liabilities Associated with Assets Held for Sale $ 1.5