Benefit Plans (Tables)

9 Months Ended

Sep. 27, 2015

Benefit Plans [Abstract]

Components of net periodic benefit cost

Components of Net Periodic Benefit Cost

	Pension Benefits
	Three Months Ended						Nine Months Ended
	Sept. 27, 2015			Sept. 28, 2014			Sept. 27, 2015			Sept. 28, 2014
	(millions of dollars)
Service cost	$	2.8		$	2.1		$	8.1		$	6.5
Interest cost		3.7			4.0			11.6			10.8
Expected return on plan assets		(4.9	)		(5.0	)		(14.9	)		(14.2	)
Amortization:
Prior service cost		0.1			0.3			0.6			0.9
Recognized net actuarial loss		3.2			1.9			8.9			5.4
Net periodic benefit cost	$	4.9		$	3.3		$	14.3		$	9.4

	Other Benefits
	Three Months Ended						Nine Months Ended
	Sept. 27, 2015			Sept. 28, 2014			Sept. 27, 2015			Sept. 28, 2014
	(millions of dollars)
Service cost	$	0.1		$	-		$	0.3		$	0.3
Interest cost		0.1			0.1			0.3			0.3
Amortization:
Prior service cost		(0.7	)		(0.8	)		(2.3	)		(2.3	)
Recognized net actuarial (gain)/loss		(0.1	)		(0.1	)		(0.1	)		(0.2	)
Net periodic benefit cost	$	(0.6	)	$	(0.8	)	$	(1.8	)	$	(1.9	)