PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Changes in net periodic benefit cost
Settlements			$ 15.2	$ 9.0
Pension Benefits
Changes in net periodic benefit cost
Service cost - benefits earned during the period	1.3	1.0	2.6	1.9
Interest cost on projected benefit obligations	3.6	4.0	7.2	7.9
Expected return on plan assets	(4.1)	(3.9)	(8.2)	(7.9)
Amortization of net actuarial loss	1.7	1.3	3.3	2.6
Amortization of Prior Service Benefit	0	0	0	0
Net periodic benefit cost	2.5	2.4	4.9	4.5
Settlements	8.3	9.0	15.2	9.0
Total net periodic benefit cost	10.8	11.4	20.1	13.5
Other Benefits
Changes in net periodic benefit cost
Service cost - benefits earned during the period	0.2	0.3	0.5	0.5
Interest cost on projected benefit obligations	0.3	0.3	0.6	0.6
Expected return on plan assets	0	0	0	0
Amortization of net actuarial loss	0.5	0.5	0.9	1.0
Amortization of Prior Service Benefit	0	(0.1)	0	(0.1)
Net periodic benefit cost	1.0	1.0	2.0	2.0
Settlements	0	0	0	0
Total net periodic benefit cost	$ 1.0	$ 1.0	$ 2.0	$ 2.0