USE OF DERIVATIVES, OFFSETTING DISCLOSURES AND CHANGES IN OTHER COMPREHENSIVE INCOME BY COMPONENT - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Dec. 31, 2010
Derivative Instruments And Hedging Activities Disclosures [Line Items]
SWAP agreement notional amount during period	$ 1,300.0	$ 4,500.0	$ 100.0
SWAP agreement average interest rate during period	0.01%	0.71%	4.09%
Swap agreement notional amount expiring during period		$ 800.0
SWAP agreement average interest rate expiring during period		2.20%
SWAP agreement terminated notional amount during period	$ 1,900.0	$ 7,100.0
SWAP agreement terminated average interest rate during period	1.63%	1.66%
Derivative instruments unrealized gains to be recognized		$ 6.1
Interest Rate Swap Agreements [Member] | Minimum [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Payment term of LIBOR interest rate agreement		18 months
Interest Rate Swap Agreements [Member] | Maximum [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Payment term of LIBOR interest rate agreement		3 years
Interest Rate SWAP Currently-Paying Contracts Expiring Third Quarter 2021 [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
SWAP agreement terminated notional amount during period		$ 700.0
SWAP agreement terminated average interest rate during period		1.52%