Retirement Plans (Tables)

9 Months Ended

Sep. 30, 2021

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						9 Months Ended
	September 30,						September 30,
	2021			2020			2021			2020
Service cost	$	5.5		$	5.3		$	16.6		$	15.5
Interest cost		1.5			2.4			4.6			7.0
Expected return on assets		(3.1	)		(3.4	)		(9.2	)		(10.0	)
Settlement loss		—			—			—			10.2
Other		1.4			0.9			4.1			2.5
Total benefit cost	$	5.3		$	5.2		$	16.1		$	25.2
	Retiree Health Care Plan
	3 Months Ended						9 Months Ended
	September 30,						September 30,
	2021			2020			2021			2020
Interest cost	$	0.1		$	0.1		$	0.2		$	0.3
Prior service credit		(0.2	)		(0.1	)		(0.6	)		(0.5	)
Other		—			—			0.1			—
Total benefit credit	$	(0.1	)	$	—		$	(0.3	)	$	(0.2	)