PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Changes in net periodic benefit cost
Defined Benefit Plan, Contributions by Employer			$ 6.1	$ 24.9
Pension Benefits
Changes in net periodic benefit cost
Service cost - benefits earned during the period	1.3	1.0	3.9	2.9
Interest cost on projected benefit obligations	3.6	3.8	10.8	11.7
Expected return on plan assets	(4.1)	(4.2)	(12.3)	(12.1)
Amortization of net actuarial loss	1.7	1.4	5.0	4.0
Amortization of Prior Service Benefit	0	0	0	0
Net periodic benefit cost	2.5	2.0	7.4	6.5
Settlements	2.5	4.1	17.7	13.1
Total net periodic benefit cost	5.0	6.1	25.1	19.6
Other Benefits
Changes in net periodic benefit cost
Service cost - benefits earned during the period	0.3	0.2	0.8	0.7
Interest cost on projected benefit obligations	0.4	0.4	1.0	1.0
Expected return on plan assets	0	0	0	0
Amortization of net actuarial loss	0.4	0.4	1.3	1.4
Amortization of Prior Service Benefit	(0.1)	0	(0.1)	(0.1)
Net periodic benefit cost	1.0	1.0	3.0	3.0
Settlements	0	0	0	0
Total net periodic benefit cost	$ 1.0	$ 1.0	$ 3.0	$ 3.0