INCOME TAXES - Net Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets
Pension and post-retirement benefits	$ 234.3	$ 207.4
Other accrued liabilities	154.7	127.5
Lease liability	95.5	104.8
Credit carryforwards	76.6	18.7
Loss carryforwards	63.4	48.0
Share-based compensation	44.8	55.0
Other, net	77.0	57.5
Valuation allowance	(45.3)	(24.5)
Total deferred tax assets	701.0	594.4
Deferred tax liabilities
Intangible assets	(598.9)	(569.9)
Property, plant and equipment	(317.8)	(258.1)
Lease asset	(95.4)	(105.2)
Other, net	(9.6)	(62.3)
Total deferred tax liabilities	(1,021.7)	(995.5)
Net deferred tax liabilities balance	(320.7)	$ (401.1)
Federal
Deferred tax assets
Loss carryforwards	0.1
State
Deferred tax assets
Credit carryforwards	19.1
Loss carryforwards	20.2
International
Deferred tax assets
Credit carryforwards	57.7
Loss carryforwards	$ 43.1