Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENTS - Narrative (Details)

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FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Unrealized gains forecasted to be included in earnings transferred from AOCI in the next twelve months $ (4.2)    
Level 2 | Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fixed rate mortgages, fair value disclosure $ 279.0   $ 276.5
Weighted average market interest rate (percent) 3.88% 4.17%  
Weighted average contractual interest rate (percent) 4.84% 4.85%  
Designated as Hedging Instrument | Interest Rate Swap      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Notional amount $ 795.0   795.0
Weighted average remaining term 4 years 2 months    
Weighted average fixed rate (percent) 1.87%    
Reported Value Measurement      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fixed rate mortgages, fair value disclosure $ 266.9   $ 268.1