RECEIVABLES - Amortized cost basis of financial assets (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, originated in fiscal year before latest fiscal year	$ 107.6	$ 131.3
Moody's, Ba2 Rating
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, originated in fiscal year before latest fiscal year	78.5	107.6
Moody's, B3 Rating
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, originated in fiscal year before latest fiscal year	$ 29.1	$ 23.7