EQUITY COMPENSATION - Performance-Based Restricted Unit Awards with a Market Condition (Details) - Restricted units with a market condition - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended	9 Months Ended
	Jan. 31, 2021	Mar. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Equity compensation
Granted restricted unit consecutive calendar days		30 days
Granted (in shares)			2,150,000
Weighted average grant date fair value (in dollars per share)			$ 0		$ 0
Fair Value
Closing price of the Company's common shares as of valuation date (in dollars per share)			$ 45.76
Risk-free interest rate			0.88%
Volatility			35.00%
Dividend yield			3.50%
Cost of equity			10.00%
Market Condition Awards Units
Balance at the beginning of the period (in shares)	0	0	0
Granted (in shares)			2,150,000
Vested (in shares)			(1,925,000)
Forfeited (in shares)			(225,000)
Balance at the end of the period (in shares)			0
Weighted Average Grant Date Fair Value Per Unit
Weighted average grant date fair value (in dollars per share)			$ 0		$ 0
Granted (in dollars per share)			32.86
Vested (in dollars per share)			33.21
Forfeited (in dollars per share)			$ 29.84
Share-based compensation expense			$ 43.4
Tranche I
Equity compensation
Granted (in shares)		537,500
Weighted average price of shares purchased (in dollars per share)		$ 55.00
Weighted average grant date fair value (in dollars per share)	$ 37.28
Vesting period	8 months 12 days
Market Condition Awards Units
Granted (in shares)		537,500
Weighted Average Grant Date Fair Value Per Unit
Weighted average grant date fair value (in dollars per share)	$ 37.28
Unrecognized compensation expenses				$ 14.0
Tranche II
Equity compensation
Granted (in shares)		537,500
Weighted average price of shares purchased (in dollars per share)		$ 60.00
Weighted average grant date fair value (in dollars per share)	$ 34.47
Vesting period	1 year 2 months 12 days
Market Condition Awards Units
Granted (in shares)		537,500
Weighted Average Grant Date Fair Value Per Unit
Weighted average grant date fair value (in dollars per share)	$ 34.47
Unrecognized compensation expenses			29.4
Tranche III
Equity compensation
Granted (in shares)		537,500
Weighted average price of shares purchased (in dollars per share)		$ 65.00
Weighted average grant date fair value (in dollars per share)	$ 31.92
Vesting period	1 year 7 months 6 days
Market Condition Awards Units
Granted (in shares)		537,500
Weighted Average Grant Date Fair Value Per Unit
Weighted average grant date fair value (in dollars per share)	$ 31.92
Unrecognized compensation expenses			29.4
Tranche IV
Equity compensation
Granted (in shares)		537,500
Weighted average price of shares purchased (in dollars per share)		$ 75.00
Weighted average grant date fair value (in dollars per share)	$ 27.75
Vesting period	2 years 3 months 18 days
Market Condition Awards Units
Granted (in shares)		537,500
Weighted Average Grant Date Fair Value Per Unit
Weighted average grant date fair value (in dollars per share)	$ 27.75
Unrecognized compensation expenses			$ 29.4