SENIOR NOTES PAYABLE AND OTHER DEBT - Senior Notes (Details) $ in Millions, $ in Millions	1 Months Ended			6 Months Ended
	May 02, 2024 USD ($)	Apr. 30, 2024 CAD ($)	Apr. 30, 2024 USD ($)	Jun. 30, 2024 CAD ($)	Jun. 30, 2024 USD ($)	May 13, 2024 USD ($)	Feb. 29, 2024 CAD ($)	Feb. 29, 2024 USD ($)
Senior Notes
Debt instruments
Repayments of senior debt	$ 800.0
Senior Notes | 5.100% Senior Notes, Series J due 2029
Debt instruments
Debt instrument, face amount							$ 650.0	$ 475.3
Senior Notes | 5.63% Senior Notes due 2034
Debt instruments
Debt instrument, face amount						$ 500.0
5.100% Senior Notes, Series J due 2029
Debt instruments
Interest rate							5.10%	5.10%
Unsecured Term Loan due 2025
Debt instruments
Repayment and extinguishment of unsecured term loan				$ 500.0	$ 367.9
3.50% Senior Notes due 2024
Debt instruments
Interest rate				3.50%	3.50%
Repayments of senior debt	400.0
3.75% Senior Notes due 2024
Debt instruments
Interest rate				3.75%	3.75%
Repayments of senior debt	$ 400.0
2.80% Senior Notes, Series E due 2024
Debt instruments
Interest rate				2.80%	2.80%
Repayments of senior debt		$ 73.0	$ 53.4	$ 73.0	$ 53.4
5.63% Senior Notes due 2034
Debt instruments
Interest rate				5.625%	5.625%	5.625%