EMPLOYEE BENEFIT PLANS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Pension Benefits
Components of net periodic benefit cost
Service cost	$ 12.4	$ 11.3
Interest cost	19.8	20.5
Expected return on plan assets	(27.1)	(24.7)
Amortization of prior service cost (credit)	1.2	1.3
Amortization of net actuarial loss	8.3	4.7
Net periodic benefit cost	14.6	13.1
Contributed to benefit plans	171.5
Additional contributions to plans during the remainder of fiscal year	3.8
Other Benefits
Components of net periodic benefit cost
Service cost	5.5	5.0
Interest cost	7.2	7.7
Expected return on plan assets	(7.0)	(5.0)
Amortization of transition obligation	0.1	0.1
Amortization of prior service cost (credit)	(0.9)	(0.9)
Amortization of net actuarial loss	1.6	1.1
Net periodic benefit cost	6.5	8.0
Contributed to benefit plans	75.1
Additional contributions to plans during the remainder of fiscal year	$ 39.1