Retirement Plans (Tables)

6 Months Ended

Jun. 30, 2020

Compensation And Retirement Disclosure [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,
	2020			2019			2020			2019
Service cost	$	5.1		$	4.3		$	10.2		$	6.8
Interest cost		2.3			3.2			4.6			6.3
Expected return on assets		(3.2	)		(3.6	)		(6.6	)		(5.9	)
Settlement loss		—			—			10.2			—
Other		0.7			0.4			1.6			0.9
Total benefit cost	$	4.9		$	4.3		$	20.0		$	8.1
	Retiree Health Care Plan
	3 Months Ended						6 Months Ended
	June 30,						June 30,
	2020			2019			2020			2019
Interest cost	$	0.1		$	0.2		$	0.2		$	0.3
Prior service credit		(0.2	)		(0.2	)		(0.4	)		(0.4	)
Total benefit credit	$	(0.1	)	$	—		$	(0.2	)	$	(0.1	)