Retirement Plans (Tables)

6 Months Ended

Jun. 30, 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:

	Defined Benefit Pension Plan
	3 Months Ended						6 Months Ended
	June 30,						June 30,
	2022			2021			2022			2021
Service cost	$	4.9		$	5.5		$	10.0		$	11.1
Interest cost		2.2			1.6			4.5			3.1
Expected return on assets		(3.6	)		(3.0	)		(7.5	)		(6.1	)
Net loss		0.4			1.1			0.9			2.3
Prior service cost		0.1			0.2			0.3			0.4
Total benefit cost	$	4.0		$	5.4		$	8.2		$	10.8
	Retiree Health Care Plan
	3 Months Ended						6 Months Ended
	June 30,						June 30,
	2022			2021			2022			2021
Interest cost	$	—		$	—		$	0.1		$	0.1
Prior service credit		(0.2	)		(0.2	)		(0.4	)		(0.4	)
Net Loss		0.1			0.1			0.1			0.1
Total benefit credit	$	(0.1	)	$	(0.1	)	$	(0.2	)	$	(0.2	)