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INCOME TAXES - Additional Information (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income tax expense (benefit)		$ 43.4	$ (7.2)	$ 87.0	$ 61.1
Income tax expense, percentage of pre-tax income		12.90%	(2.50%)	9.40%	8.00%
Effective tax rate		21.00%	35.00%
Tax benefit from expiration of statutes of limitations		$ 4.6	$ 14.9	$ 4.6	$ 14.9
Tax benefits from reevaluation of certain unrecognized tax benefits			$ 53.5		$ 45.7
Provisional income tax expense						$ 317.8
Provisional estimate of minimum tax on foreign earnings		12.6		28.1
Repatriated undistributed foreign earnings	$ 1,600.0
Repatriated cash, cash equivalents and investments	1,400.0
Repatriated note	$ 200.0
Total gross unrecognized tax benefits		$ 73.7		73.7		$ 65.4
Net increase (decrease) of unrecognized tax benefits				$ 8.3

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