Benefit Plans (Tables)

3 Months Ended

Apr. 01, 2018

Benefit Plans [Abstract]

Components of net periodic benefit cost

Components of Net Periodic Benefit Cost

	Pension Benefits
	Three Months Ended
	Apr. 1, 2018			Apr. 2, 2017
	(millions of dollars)
Service cost	$	2.0		$	2.1
Interest cost		3.0			3.1
Expected return on plan assets		(4.8	)		(4.5	)
Amortization:
Prior service cost		0.2			0.5
Recognized net actuarial loss		2.7			2.1
Net periodic benefit cost	$	3.1		$	3.3

	Other Benefits
	Three Months Ended
	Apr. 1, 2018			Apr. 2, 2017
	(millions of dollars)
Service cost	$	0.1		$	0.1
Interest cost		0.1			0.1
Amortization:
Prior service cost		(0.3	)		(0.8	)
Recognized net actuarial (gain)/loss		(0.2	)		(0.1	)
Net periodic benefit cost	$	(0.3	)	$	(0.7	)