EMPLOYEE BENEFIT PLANS (Details 4) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Pension Benefits
Change in Benefit Obligation
Benefit obligation at beginning of year	$ 192.6	$ 189.8
Service cost	2.7	5.4	4.6
Interest cost	9.0	10.7	10.3
Actuarial (gain) loss	14.9	20.7
Benefits paid	(9.1)	(9.2)
Amendments/Curtailments		(24.8)
Benefit obligation at end of year	210.1	192.6	189.8
Changes in plan assets
Balance at the beginning of the period	126.0	137.9
Actual return on plan assets	19.0	(7.1)
Employer contribution	13.3	4.4	5.9
Benefits paid	(9.1)	(9.2)
Balance at the end of the period	149.2	126.0	137.9
Funded Status and Recognized Liability	(60.9)	(66.6)
Qualified Plans
Change in Benefit Obligation
Benefit obligation at end of year	210.1	192.6
Changes in plan assets
Balance at the end of the period	149.2	126.0
Accumulated benefit obligation	209.6	191.9
Other Post-retirement Benefits
Change in Benefit Obligation
Benefit obligation at beginning of year	48.5	51.8
Service cost	1.0	0.9	0.7
Interest cost	2.3	3.0	2.6
Plan participants' contributions	1.3	1.2
Actuarial (gain) loss	(0.6)	(4.7)
Benefits paid	(3.3)	(3.7)
Benefit obligation at end of year	49.2	48.5	51.8
Changes in plan assets
Benefits paid	(3.3)	(3.7)
Funded Status and Recognized Liability	$ (49.2)	$ (48.5)