REVENUE FROM LESSOR ARRANGEMENTS AND CONTRACT WITH CUSTOMERS - Lease and Service Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Lease revenue
Total service revenue	$ 970.1	$ 903.2	$ 1,013.5
Total	970.1	903.2	1,013.5
VERIFI Sales Arrangements
Lease revenue
Lease payments revenue	27.7	28.8	26.8
Variable lease revenue	11.0	10.3	7.8
Total	38.7	39.1	34.6
Total service revenue	8.8	7.6	5.0
Total	47.5	46.7	39.6
VERIFI Sales Arrangements | Fixed installation revenue
Lease revenue
Total service revenue	2.0	1.2	0.1
VERIFI Sales Arrangements | Variable revenue
Lease revenue
Total service revenue	$ 6.8	$ 6.4	$ 4.9