Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENTS - Narrative (Details)

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FAIR VALUE MEASUREMENTS - Narrative (Details)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unrealized gains $ 12.9  
Fixed Rate Private Placement Notes | Unsecured debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Weighted average contractual interest rate 3.08% 3.09%
Level 2 | Weighted Average | Fixed Rate Private Placement Notes | Measurement Input, Discount Rate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Weighted average market interest rate 0.0522 0.0281
Level 2 | Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed rate mortgages, fair value disclosure $ 295.7 $ 319.9
Weighted average market interest rate (percent) 4.66% 2.55%
Weighted average contractual interest rate (percent) 4.11% 4.12%
Estimate of Fair Value Measurement    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Private placement notes $ 871.3 $ 931.1
Reported Value Measurement    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Private placement notes 1,030.0 905.0
Fixed rate mortgages, fair value disclosure 301.8 303.9
Designated as Hedging Instrument | Interest Rate Swap    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notional amount $ 1,125.0 $ 1,125.0
Weighted average remaining term 2 years 8 months 12 days