EMPLOYEE BENEFITS PLANS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Pension Benefits
Components of net periodic benefit cost
Service cost	$ 7.5	$ 12.4
Interest cost	17.8	19.8
Expected return on plan assets	(26.6)	(27.1)
Amortization of prior service cost (credit)	1.0	1.2
Amortization of net actuarial loss	13.5	8.3
Net periodic benefit cost	13.2	14.6
Contribution to the plans	63.2
Additional contributions to plans during the remainder of fiscal year	4.7
Other Benefits
Components of net periodic benefit cost
Service cost	6.5	5.5
Interest cost	6.3	7.2
Expected return on plan assets	(7.7)	(7.0)
Amortization of transition obligation		0.1
Amortization of prior service cost (credit)	(0.6)	(0.9)
Amortization of net actuarial loss	2.0	1.6
Net periodic benefit cost	6.5	6.5
Additional contributions to plans during the remainder of fiscal year	$ 32.8