GOODWILL AND OTHER INTANGIBLE ASSETS (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Changes in the carrying amount of goodwill
Beginning goodwill, net	$ 6,490.8
Current year business combinations	0.6
Prior year business combinations	3.3
Effect of foreign currency translation	9.7
Ending goodwill, net	6,504.4
Goodwill expected to be tax deductible	0.0
Impairment of goodwill	0.0
Future estimated amortization expense related to amortizable other identifiable intangible assets
2016 (Remainder: six month period)	149.7
Total amortization expense related to other intangible assets	145.3	$ 146.0
Nalco | Trademarks
Changes in the carrying amount of goodwill
Impairment of indefinite life intangible asset	0.0
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]
Indefinite-Lived Intangible Assets (Excluding Goodwill)	1,200.0
Global Industrial
Changes in the carrying amount of goodwill
Beginning goodwill, net	2,560.8
Prior year business combinations	3.5
Reclassifications	3.5
Effect of foreign currency translation	3.7
Ending goodwill, net	2,571.5
Global Institutional
Changes in the carrying amount of goodwill
Beginning goodwill, net	662.7
Reclassifications	(0.6)
Effect of foreign currency translation	1.0
Ending goodwill, net	663.1
Global Energy
Changes in the carrying amount of goodwill
Beginning goodwill, net	3,151.5
Current year business combinations	0.6
Prior year business combinations	(0.2)
Reclassifications	(2.9)
Effect of foreign currency translation	4.8
Ending goodwill, net	3,153.8
Other
Changes in the carrying amount of goodwill
Beginning goodwill, net	115.8
Effect of foreign currency translation	0.2
Ending goodwill, net	$ 116.0