Retirement Plans (Tables)

9 Months Ended

Sep. 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						9 Months Ended
	September 30,						September 30,
	2020			2019			2020			2019
Service cost	$	5.3		$	4.1		$	15.5		$	10.9
Interest cost		2.4			3.2			7.0			9.5
Expected return on assets		(3.4	)		(3.5	)		(10.0	)		(9.4	)
Settlement loss		—			—			10.2			—
Other		0.9			0.5			2.5			1.4
Total benefit cost	$	5.2		$	4.3		$	25.2		$	12.4
	Retiree Health Care Plan
	3 Months Ended						9 Months Ended
	September 30,						September 30,
	2020			2019			2020			2019
Interest cost	$	0.1		$	0.1		$	0.3		$	0.4
Prior service credit		(0.1	)		(0.2	)		(0.5	)		(0.6	)
Total benefit credit	$	—		$	(0.1	)	$	(0.2	)	$	(0.2	)