Benefit Plans (Tables)

3 Months Ended

Apr. 04, 2021

Benefit Plans [Abstract]

Net Periodic Benefit Cost

Components of Net Periodic Benefit Cost

	Pension Benefits
	Three Months Ended
(millions of dollars)	Apr. 4, 2021			Mar. 29, 2020
Service cost	$	2.0		$	2.0
Interest cost		2.0			2.9
Expected return on plan assets		(5.4	)		(5.2	)
Amortization:
Prior service cost		0.1			0.1
Recognized net actuarial loss		3.4			2.8
Net periodic benefit cost	$	2.1		$	2.6

	Other Benefits
	Three Months Ended
(millions of dollars)	Apr. 4, 2021			Mar. 29, 2020
Service cost	$	—		$	0.1
Interest cost		—			—
Amortization:
Recognized net actuarial (gain)		(0.2	)		(0.2	)
Net periodic benefit cost	$	(0.2	)	$	(0.1	)