RESTRUCTURING AND OTHER COSTS - RESTRUCTURING ACCRUALS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Restructuring Reserve [Roll Forward]
Beginning Balance	$ 41.2	$ 9.3
Provisions and adjustments	25.7	68.0
Amounts applied	(29.5)	(29.5)
Change in estimates	(4.9)	(6.6)
Ending Balance	32.5	41.2
Severances
Restructuring Reserve [Roll Forward]
Beginning Balance	36.1	6.0
Provisions and adjustments	16.1	59.8
Amounts applied	(22.1)	(24.1)
Change in estimates	(1.3)	(5.6)
Ending Balance	28.8	36.1
Severances | 2013 and Prior Plans
Restructuring Reserve [Roll Forward]
Beginning Balance	0.3	1.0
Provisions and adjustments		0.1
Amounts applied		(0.7)
Change in estimates		(0.1)
Ending Balance		0.3
Severances | 2014 Plans
Restructuring Reserve [Roll Forward]
Beginning Balance	1.2	5.0
Provisions and adjustments		0.7
Amounts applied		(4.1)
Change in estimates		(0.4)
Ending Balance		1.2
Severances | 2014 and Prior Plans
Restructuring Reserve [Roll Forward]
Beginning Balance	1.5
Provisions and adjustments	0.0
Amounts applied	(0.8)
Change in estimates	(0.1)
Ending Balance	0.6	1.5
Severances | 2015 Plans
Restructuring Reserve [Roll Forward]
Beginning Balance	34.6	0.0
Provisions and adjustments	4.7	59.0
Amounts applied	(18.5)	(19.3)
Change in estimates	(0.8)	(5.1)
Ending Balance	20.0	34.6
Severances | 2016 Plans
Restructuring Reserve [Roll Forward]
Beginning Balance	0.0
Provisions and adjustments	11.4
Amounts applied	(2.8)
Change in estimates	(0.4)
Ending Balance	8.2	0.0
Lease/Contract Terminations
Restructuring Reserve [Roll Forward]
Beginning Balance	4.2	2.2
Provisions and adjustments	5.9	4.5
Amounts applied	(3.9)	(1.8)
Change in estimates	(3.2)	(0.7)
Ending Balance	3.0	4.2
Lease/Contract Terminations | 2013 and Prior Plans
Restructuring Reserve [Roll Forward]
Beginning Balance	0.3	0.5
Provisions and adjustments		0.0
Amounts applied		(0.2)
Change in estimates		0.0
Ending Balance		0.3
Lease/Contract Terminations | 2014 Plans
Restructuring Reserve [Roll Forward]
Beginning Balance	0.5	1.7
Provisions and adjustments		(0.5)
Amounts applied		(0.7)
Change in estimates		0.0
Ending Balance		0.5
Lease/Contract Terminations | 2014 and Prior Plans
Restructuring Reserve [Roll Forward]
Beginning Balance	0.8
Provisions and adjustments	0.0
Amounts applied	(0.4)
Change in estimates	(0.2)
Ending Balance	0.2	0.8
Lease/Contract Terminations | 2015 Plans
Restructuring Reserve [Roll Forward]
Beginning Balance	3.4	0.0
Provisions and adjustments	5.4	5.0
Amounts applied	(3.3)	(0.9)
Change in estimates	(3.0)	(0.7)
Ending Balance	2.5	3.4
Lease/Contract Terminations | 2016 Plans
Restructuring Reserve [Roll Forward]
Beginning Balance	0.0
Provisions and adjustments	0.5
Amounts applied	(0.2)
Change in estimates	0.0
Ending Balance	0.3	0.0
Other Restructuring Costs
Restructuring Reserve [Roll Forward]
Beginning Balance	0.9	1.1
Provisions and adjustments	3.7	3.7
Amounts applied	(3.5)	(3.6)
Change in estimates	(0.4)	(0.3)
Ending Balance	0.7	0.9
Other Restructuring Costs | 2013 and Prior Plans
Restructuring Reserve [Roll Forward]
Beginning Balance	0.0	0.0
Provisions and adjustments		0.0
Amounts applied		0.0
Change in estimates		0.0
Ending Balance		0.0
Other Restructuring Costs | 2014 Plans
Restructuring Reserve [Roll Forward]
Beginning Balance	0.3	1.1
Provisions and adjustments		0.2
Amounts applied		(0.8)
Change in estimates		(0.2)
Ending Balance		0.3
Other Restructuring Costs | 2014 and Prior Plans
Restructuring Reserve [Roll Forward]
Beginning Balance	0.3
Provisions and adjustments	0.1
Amounts applied	(0.2)
Change in estimates	0.0
Ending Balance	0.2	0.3
Other Restructuring Costs | 2015 Plans
Restructuring Reserve [Roll Forward]
Beginning Balance	0.6	0.0
Provisions and adjustments	3.1	3.5
Amounts applied	(3.0)	(2.8)
Change in estimates	(0.4)	(0.1)
Ending Balance	0.3	0.6
Other Restructuring Costs | 2016 Plans
Restructuring Reserve [Roll Forward]
Beginning Balance	0.0
Provisions and adjustments	0.5
Amounts applied	(0.3)
Change in estimates	0.0
Ending Balance	$ 0.2	$ 0.0