Benefit Plans (Tables)

6 Months Ended

Jul. 03, 2016

Benefit Plans [Abstract]

Components of net periodic benefit cost

Components of Net Periodic Benefit Cost

	Pension Benefits
	Three Months Ended						Six Months Ended
	July 3, 2016			June 28, 2015			July 3, 2016			June 28, 2015
	(millions of dollars)
Service cost	$	2.4		$	2.7		$	4.7		$	5.3
Interest cost		3.4			3.9			6.8			7.8
Expected return on plan assets		(4.7	)		(5.0	)		(9.3	)		(10.1	)
Amortization:
Prior service cost		0.2			0.3			0.4			0.6
Recognized net actuarial loss		2.5			3.0			5.1			5.7
Net periodic benefit cost	$	3.8		$	4.9		$	7.7		$	9.3

	Other Benefits
	Three Months Ended						Six Months Ended
	July 3, 2016			June 28, 2015			July 3, 2016			June 28, 2015
	(millions of dollars)
Service cost	$	0.1		$	0.1		$	0.2		$	0.2
Interest cost		0.1			0.1			0.2			0.2
Amortization:
Prior service cost		(0.7	)		(0.7	)		(1.5	)		(1.5	)
Recognized net actuarial gain		(0.1	)		(0.1	)		(0.1	)		(0.1	)
Net periodic benefit cost	$	(0.6	)	$	(0.6	)	$	(1.2	)	$	(1.2	)