RESTRUCTURING AND OTHER COSTS - RESTRUCTURING ACCURALS (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Restructuring Reserve [Roll Forward]
Restructuring and other costs	$ 1.3	$ 42.4	$ 43.8	$ 62.9
Severance
Restructuring Reserve [Roll Forward]
Beginning Balance			27.0
Restructuring and other costs			6.0
Amounts applied			8.1
Change in estimates			(1.9)
Ending Balance	23.0		23.0
Severance | 2018 and Prior Plans
Restructuring Reserve [Roll Forward]
Beginning Balance			7.2
Restructuring and other costs			1.0
Amounts applied			2.2
Change in estimates			(0.4)
Ending Balance	5.6		5.6
Severance | 2019 Plans
Restructuring Reserve [Roll Forward]
Beginning Balance			19.8
Restructuring and other costs			0.9
Amounts applied			5.6
Change in estimates			(1.5)
Ending Balance	13.6		13.6
Severance | 2020 Plans
Restructuring Reserve [Roll Forward]
Beginning Balance			0.0
Restructuring and other costs			4.1
Amounts applied			0.3
Change in estimates			0.0
Ending Balance	3.8		3.8
Lease/Contract Terminations
Restructuring Reserve [Roll Forward]
Beginning Balance			0.5
Restructuring and other costs			0.4
Amounts applied			0.4
Ending Balance	0.5		0.5
Lease/Contract Terminations | 2018 and Prior Plans
Restructuring Reserve [Roll Forward]
Beginning Balance			0.5
Restructuring and other costs			0.3
Amounts applied			0.3
Ending Balance	0.5		0.5
Lease/Contract Terminations | 2020 Plans
Restructuring Reserve [Roll Forward]
Beginning Balance			0.0
Restructuring and other costs			0.1
Amounts applied			0.1
Ending Balance	0.0		0.0
Other Restructuring Costs
Restructuring Reserve [Roll Forward]
Beginning Balance			2.5
Restructuring and other costs			0.1
Amounts applied			0.3
Change in estimates			(0.1)
Ending Balance	2.2		2.2
Other Restructuring Costs | 2018 and Prior Plans
Restructuring Reserve [Roll Forward]
Beginning Balance			2.2
Restructuring and other costs			0.0
Amounts applied			0.0
Change in estimates			0.0
Ending Balance	2.2		2.2
Other Restructuring Costs | 2019 Plans
Restructuring Reserve [Roll Forward]
Beginning Balance			0.3
Restructuring and other costs			0.3
Amounts applied			0.5
Change in estimates			(0.1)
Ending Balance	0.0		0.0
Other Restructuring Costs | 2020 Plans
Restructuring Reserve [Roll Forward]
Beginning Balance			0.0
Restructuring and other costs			(0.2)
Amounts applied			0.2
Change in estimates			0.0
Ending Balance	$ 0.0		$ 0.0