Retirement Plans (Tables)

3 Months Ended

Mar. 31, 2022

Retirement Benefits [Abstract]

Components of Net Periodic Benefit Cost (Credit)

The components of the net periodic benefit cost (credit) for our plans were as follows:

	Three Months Ended March 31,
	Defined Benefit Pension Plans						Retiree Health Care Plan
	2022			2021			2022			2021
Service cost	$	5.1		$	5.6		$	—		$	—
Interest cost		2.3			1.5			0.1			0.1
Expected return on assets		(3.9	)		(3.1	)		—			—
Net loss		0.5			1.2			—			—
Prior service cost (credit)		0.2			0.2			(0.2	)		(0.2	)
Total benefit cost (credit)	$	4.2		$	5.4		$	(0.1	)	$	(0.1	)