PENSION AND POST-RETIREMENT PLANS (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Qualified Pension Plans
Components of Net Periodic Benefit Cost
Service cost	$ 2.5	$ 2.1
Interest cost	7.1	6.5
Expected return on plan assets	(10.5)	(8.9)
Amortization of net loss	2.3	5.1
Amortization of prior service cost	(1.7)	(1.7)
Net periodic benefit cost	(0.3)	3.1
Full year cash contributions to pension plan	6.5
Postretirement Benefit Plans
Components of Net Periodic Benefit Cost
Service cost	0.8	0.8
Interest cost	1.9	1.6
Amortization of net loss	0.4	0.2
Net periodic benefit cost	$ 3.1	$ 2.6