PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Changes in net periodic benefit cost
Settlements	$ (6.9)	$ 0
Pension Benefits
Changes in net periodic benefit cost
Service cost - benefits earned during the period	1.3	0.9
Interest cost on projected benefit obligations	3.6	3.9
Expected return on plan assets	(4.1)	(4.0)
Amortization of net actuarial loss	1.6	1.3
Net periodic benefit cost	2.4	2.1
Settlements	6.9	0
Total net periodic benefit cost	9.3	2.1
Other Benefits
Changes in net periodic benefit cost
Service cost - benefits earned during the period	0.3	0.2
Interest cost on projected benefit obligations	0.3	0.3
Expected return on plan assets	0	0
Amortization of net actuarial loss	0.4	0.5
Net periodic benefit cost	1.0	1.0
Settlements	0	0
Total net periodic benefit cost	$ 1.0	$ 1.0