PENSION AND OTHER POST-EMPLOYMENT BENEFIT PLANS (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Changes in net periodic benefit cost
Curtailments	$ 0.0	$ (5.4)	$ 0.0	$ (5.4)
Defined benefit plan, contributions by employer			86.6	4.2
Pension Benefits
Changes in net periodic benefit cost
Defined Benefit Plan, Net Periodic Benefit Cost Excluding Settlements, Curtailments and Actuarial Gains (Losses)	(0.2)	0.6	1.8	3.4
Service cost – benefits earned during the period	0.6	0.8	2.1	3.6
Interest cost on projected benefit obligations	2.6	3.6	10.0	11.2
Amortization of transition cost	0.0	0.0	0.0	0.2
Expected return on plan assets	(3.4)	(3.8)	(10.3)	(11.6)
Curtailments	0.0	(5.4)	0.0	(5.4)
Net Actuarial (Gains)/Losses	11.4	9.3	9.9	16.4
Total net periodic expense/(benefit)	11.2	4.5	11.7	14.4
Other Benefits
Changes in net periodic benefit cost
Defined Benefit Plan, Net Periodic Benefit Cost Excluding Settlements, Curtailments and Actuarial Gains (Losses)	0.8	0.6	2.4	1.8
Service cost – benefits earned during the period	0.3	0.2	0.9	0.6
Interest cost on projected benefit obligations	0.5	0.4	1.5	1.2
Amortization of transition cost	0.0	0.0	0.0	0.0
Expected return on plan assets	0.0	0.0	0.0	0.0
Curtailments	0.0	0.0	0.0	0.0
Net Actuarial (Gains)/Losses	0.0	0.0	0.0	0.0
Total net periodic expense/(benefit)	$ 0.8	$ 0.6	$ 2.4	$ 1.8