INCOME TAXES (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Effective Tax Rate Reconciliation, Net Benefit (Expense) from Discrete Items		$ (27.9)	$ 19.4	$ 2.9
Goodwill impairment tax benefit		10.8
Goodwill impairment		$ 699.8	$ 0.0	$ 0.0
Effective Tax Rate Adjusted for Discrete Items		21.00%	16.80%	25.70%
Statutory federal tax rate		21.00%	21.00%	21.00%
U.S Tax Cuts and Jobs Act Net Benefit Increase				$ 3.8
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards		$ 141.0	$ 70.0
Deferred state tax assets relating to net operating losses		25.9
State tax credit carryforward		23.3
Capital loss carry-forward		3.6
Deferred Tax Assets, Capital Loss Carryforwards		0.9
Deferred Tax Assets Tax Credit Carryforwards, US Federal		10.5
Deferred Tax Assets, Tax Credit Carryforwards, Foreign		16.9
Valuation allowance		239.6	182.1	147.4
Increases in Valuation Allowances in Foreign Jurisdictions		57.5
Unrecognized tax benefits [Abstract]
Unrecognized Tax Benefits		21.3	22.8	33.8
Impact on the effective tax rate, if recognized		21.2	22.4
Decrease for prior year tax positions	$ 14.3	3.5	14.3
Interest and penalties accrued		0.1
Interest and penalties (benefit) expense		(0.1)	$ (1.5)	$ 0.4
Reasonable possibility that unrecognized tax benefits will decrease over next twelve months		6.9
U.S.
Operating Loss Carryforwards [Line Items]
Net operating loss (NOL) carry-forward		253.1
Deferred Tax Assets, Operating Loss Carryforwards		53.2
Foreign
Operating Loss Carryforwards [Line Items]
Net operating loss (NOL) carry-forward		362.8
Deferred Tax Assets, Operating Loss Carryforwards		61.9
Operating Loss Carryforwards Subject to Expiration		59.9
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration		14.5
Operating Loss Carryforwards Not Subject to Expiration		302.9
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration		$ 47.4