PENSION AND POSTRETIREMENT PLANS (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Defined Benefit Plan Disclosures [Line Items]
Payment for Pension Benefits	$ 0.0		$ 0.0
Minimum non-elective contribution (NEC) % for the 401(K) plan (in hundredths)	3.00%
Discretionary Contribution Percentage Mininum	1.00%
Discretionary Contribution Percentage Maximum	3.00%
Defined contribution retirement plan cost	$ 14.1	$ 13.8	28.7	$ 27.2
Defined Benefit Plan and Postretirement Plan Disclosure
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment	(0.1)	0.0	(0.2)	0.0
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plan and Postretirement Plan Disclosure
Interest cost on benefit obligation	0.1	0.2	0.1	0.4
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment	0.0	0.2	(0.1)	0.4
Pension Plan [Member]
Defined Benefit Plan and Postretirement Plan Disclosure
Service cost for benefits earned	1.4	1.2	2.8	2.4
Interest cost on benefit obligation	3.5	3.9	7.2	7.8
Expected return on plan assets	(4.1)	(4.2)	(8.2)	(8.4)
Net amortization and deferral	2.7	2.8	5.5	5.6
Defined benefit/postretirement plan costs	3.5	3.7	7.3	7.4
Postretirement Health Coverage [Member]
Defined Benefit Plan and Postretirement Plan Disclosure
Defined benefit/postretirement plan costs	0.5	0.4	1.0	0.8
Other Pension, Postretirement and Supplemental Plans [Member]
Defined Benefit Plan and Postretirement Plan Disclosure
Service cost for benefits earned	0.9	0.8	1.8	1.6
Interest cost on benefit obligation	1.9	2.2	3.7	4.4
Expected return on plan assets	(2.9)	(3.1)	(5.6)	(6.2)
Net amortization and deferral	0.2	0.0	0.4	0.0
Defined benefit/postretirement plan costs	$ 0.1	$ (0.1)	$ 0.3	$ (0.2)
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	2.70%	3.80%	2.70%	3.80%
Defined Benefit Plan Expected Rate Of Return On Assets Other Assets	4.70%	5.60%	4.70%	5.60%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase	3.80%	3.60%	3.80%	3.60%
Other Pension Plan [Member]
Defined Benefit Plan and Postretirement Plan Disclosure
Service cost for benefits earned	$ 0.3	$ 0.2	$ 0.5	$ 0.5
Interest cost on benefit obligation	0.1	0.2	0.3	0.3
Net amortization and deferral	0.0	(0.1)	0.0	(0.1)
Defined benefit/postretirement plan costs	$ 0.4	$ 0.3	$ 0.8	$ 0.7
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	1.70%	2.50%	1.70%	2.50%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase	2.00%	2.00%	2.00%	2.00%
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan and Postretirement Plan Disclosure
Interest cost on benefit obligation	$ 0.1	$ 0.1	$ 0.2	$ 0.2
Net amortization and deferral	(1.7)	(4.2)	(3.4)	(8.0)
Defined benefit/postretirement plan costs	(1.6)	(4.1)	(3.2)	(7.8)
Covance [Member]
Defined Benefit Plan Disclosures [Line Items]
Defined contribution retirement plan cost	$ 13.6	$ 12.8	$ 28.6	$ 26.5