EMPLOYEE BENEFIT PLANS (Tables)

6 Months Ended

Jun. 30, 2011

EMPLOYEE BENEFIT PLANS

Components of net periodic benefit cost

	Pension Benefits						Other Postretirement Benefits
Millions of dollars	2011			2010			2011		2010
Three months ended June 30,
Service cost	$	4.6		$	4.8		$	1.1	$	1.1
Interest cost	11.1			11.9			3.0		3.2
Expected return on assets	(16.2		)	(16.5		)	-		-
Prior service cost amortization	1.8			1.8			0.3		0.2
Transition obligation amortization	-			-			0.2		0.1
Amortization of actuarial loss	3.0			4.3			0.1		0.1
Net periodic benefit cost	$	4.3		$	6.3		$	4.7	$	4.7
Six months ended June 30,
Service cost	$	9.2		$	9.5		$	2.2	$	2.2
Interest cost	22.2			23.7			6.0		6.2
Expected return on assets	(32.4		)	(32.9		)	-		-
Prior service cost amortization	3.6			3.7			0.6		0.5
Transition obligation amortization	-			-			0.4		0.3
Amortization of actuarial loss	6.0			8.6			0.2		0.2
Net periodic benefit cost	$	8.6		$	12.6		$	9.4	$	9.4