EMPLOYEE BENEFIT PLANS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Pension Benefits
Components of net periodic benefit cost (including amounts capitalized to the balance sheets)
Service cost	$ 6.6	$ 7.5
Interest cost	19.7	17.8
Expected return on plan assets	(28.9)	(26.6)
Amortization of prior service cost (credit)	0.2	1.0
Amortization of net actuarial loss	8.4	13.5
Net periodic benefit cost	6.0	13.2
Contributions to the plans	68.6
Expected contributions to the plans during the remainder of fiscal year	3.7
Other Postretirement Benefits
Components of net periodic benefit cost (including amounts capitalized to the balance sheets)
Service cost	5.9	6.5
Interest cost	7.1	6.3
Expected return on plan assets	(8.8)	(7.7)
Amortization of prior service cost (credit)	(1.3)	(0.6)
Amortization of net actuarial loss	0.7	2.0
Net periodic benefit cost	3.6	6.5
Expected contributions to the plans during the remainder of fiscal year	$ 11.8