Retirement Plans (Tables)

9 Months Ended

Sep. 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
	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2022			2021			2022			2021
Service cost	$	4.7		$	5.5		$	14.7		$	16.6
Interest cost		2.1			1.5			6.6			4.6
Expected return on assets		(3.6	)		(3.1	)		(11.1	)		(9.2	)
Net loss		0.5			—			1.4			—
Prior service cost		0.2			1.4			0.5			4.1
Total benefit cost	$	3.9		$	5.3		$	12.1		$	16.1
	Retiree Health Care Plan
	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2022			2021			2022			2021
Interest cost		0.1		$	0.1		$	0.2		$	0.2
Prior service credit		(0.2	)		(0.2	)		(0.6	)		(0.6	)
Net loss		—			—			0.1			0.1
Total benefit credit	$	(0.1	)	$	(0.1	)	$	(0.3	)	$	(0.3	)