DEBT - Acquisition Line and Real Estate Related (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Other Debt
Debt Instrument
Real estate related debt	$ 8.9	$ 22.3
Real estate related | Other Debt
Debt Instrument
Real estate related debt	769.8	796.9
U.S. Notes | Other Debt
Debt Instrument
Real estate related debt	640.4
U.K. Notes | Other Debt
Debt Instrument
Real estate related debt	129.4
Line of Credit | Acquisition Line
Debt Instrument
Acquisition line	$ 325.0	$ 303.2
Interest rate (as a percentage)	6.27%