EMPLOYEE BENEFIT PLANS (Tables)

3 Months Ended

Mar. 31, 2012

Compensation and Retirement Disclosure [Abstract]

Components of Net Periodic Benefit Cost (Income)

Components of net periodic benefit cost recorded by the Company were as follows: 

	Pension Benefits						Other Postretirement Benefits
Millions of dollars	2012			2011			2012		2011
Three months ended March 31,
Service cost	$	4.8		$	4.6		$	1.3	$	1.1
Interest cost	10.7			11.1			3.0		3.0
Expected return on assets	(14.8		)	(16.2		)	—		—
Prior service cost amortization	1.7			1.8			0.2		0.3
Transition obligation amortization	—			—			0.2		0.2
Amortization of actuarial loss	4.7			3.0			0.2		0.1
Net periodic benefit cost	$	7.1		$	4.3		$	4.9	$	4.7