DISPOSITIONS AND SPECIAL (GAINS) CHARGES - Narrative (Details) - USD ($) $ in Millions		3 Months Ended		8 Months Ended	12 Months Ended
	Aug. 31, 2018	Dec. 31, 2018	Sep. 30, 2018	Aug. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on sale of business					$ 178.9	$ 0.0	$ 0.0
Special charges, net					0.8	0.3	$ 3.9
Disposed of by Sale | NATG
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ongoing restitution proceedings						0.7
Discontinued operations incurred special charges related to updating future lease cash flows						6.9
Charges for updating future lease cash flows						6.2
Disposed of by Sale | SARL Business Segment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Combined loss on sale						23.7
Loss on sale of net assets						8.2
Translation adjustment						14.4
Legal, professional and other costs						1.1
Recovery from settlement						0.8
Severance and other personnel costs						0.3
Charges related to transitional services agreement						0.5
Charges requiring use of cash						1.4
Disposal Group, Disposed of by Sale, Not Discontinued Operations | French Business Unit
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on sale of business				$ 175.8	175.8
Proceeds from divestiture of businesses			$ 267.3
Favorable purchase price adjustments		$ 0.7
Disposal group, assets	$ 82.5	$ 82.5		$ 82.5	82.5
Disposal group, accelerated amortization for share based compensation	1.5				1.5
Disposal group, transaction and exit costs	5.1				5.1
Disposal group, operating expense requiring use of cash	$ 5.1				5.1
Transition services, period	6 months
ETG - discontinued | Disposal Group, Disposed of by Sale, Not Discontinued Operations | French Business Unit
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on sale of business					178.9
NATG
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Special charges, net					1.4
Lease reserves					2.5
Ongoing restitution proceedings					0.1
Restitution receipts					1.0
Vendor settlements					0.2
NATG and ETG
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Special charges, net						30.9
Continuing Operations | NATG
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Special charges, net					0.8
Continuing Operations | NATG and ETG
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Special charges, net						0.3
Discontinued Operations | NATG
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Special charges, net					$ 1.7
Discontinued Operations | NATG and ETG
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Special charges, net						$ 30.6