INCOME TAXES - Deferred tax assets and liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets
Accrued expenses	$ 7.0	$ 5.3
Vacation accrual	0.6	0.6
Accounts receivable	0.8	0.4
Net operating losses	30.2	31.7
Interest expense limitation		1.3
Deferred start-up costs	1.3	1.4
Stock based compensation	1.5	1.3
Operating lease liabilities	20.6
Foreign assets	9.0	1.7
Total	71.0	43.7
Valuation allowance	(7.4)
Total deferred tax assets	63.6	43.7
Valuation allowance - foreign deferred tax assets	6.1
Deferred tax liabilities
Sales-type leases		(2.3)
Prepaid expenses	(4.7)	(4.1)
481(a) adjustment	(0.9)	(1.7)
Intangible assets	(19.4)	(44.0)
Property and equipment	(82.9)	(111.7)
Right of Use Asset	(18.9)
Foreign liabilities	6.7	6.7
Total deferred tax liabilities	133.5	170.5
Net deferred tax liability	$ (69.9)	$ (126.8)