BUSINESS ACQUISITIONS Business Acquisitions in the Aggregate (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Other Long-term Debt	$ 565.0		$ 565.0		$ 56.2
Revenues	2,542.9	$ 2,430.7	4,989.9	$ 4,798.7
Payments to Acquire Businesses, Net of Cash Acquired			568.0	$ 144.1
Goodwill, Acquired During Period			141.3		398.3
Goodwill	$ 6,641.4		6,641.4		$ 6,424.4	$ 6,202.1
Excluding Covance [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired			568.0
Finite-lived Intangible Assets Acquired			$ 229.1