PENSION AND OTHER POST-EMPLOYMENT BENEFIT PLANS (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Changes in net periodic benefit cost
Defined benefit plan, contributions by employer	$ 0.0	$ 1.7
Pension Benefits
Changes in net periodic benefit cost
Defined Benefit Plan, Net Periodic Benefit Cost Excluding Settlements, Curtailments and Actuarial Gains (Losses)	(0.4)	1.0
Service cost – benefits earned during the period	0.7	0.8
Interest cost on projected benefit obligations	3.0	3.7
Expected return on plan assets	(4.1)	(3.5)
Net Actuarial (Gains)/Losses	6.1	0.0
Total net periodic expense/(benefit)	5.7	1.0
Other Benefits
Changes in net periodic benefit cost
Defined Benefit Plan, Net Periodic Benefit Cost Excluding Settlements, Curtailments and Actuarial Gains (Losses)	0.7	0.8
Service cost – benefits earned during the period	0.3	0.3
Interest cost on projected benefit obligations	0.4	0.5
Expected return on plan assets	0.0	0.0
Net Actuarial (Gains)/Losses	0.0	0.0
Total net periodic expense/(benefit)	$ 0.7	$ 0.8