OPERATING SEGMENTS AND GEOGRAPHIC INFORMATION - Service Revenue at Public Exchange Rates by Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Global Industrial
Financial information of reportable segments
Service revenue at public exchange rates	$ 37.2	$ 48.4	$ 53.2
Global Institutional
Financial information of reportable segments
Service revenue at public exchange rates	43.1	36.4	31.1
Global Energy
Financial information of reportable segments
Service revenue at public exchange rates	263.7	291.9	294.1
Other
Financial information of reportable segments
Service revenue at public exchange rates	$ 711.2	$ 670.6	$ 655.1