Other Retirement Plans (Tables)

9 Months Ended

Sep. 30, 2020

Retirement Benefits [Abstract]

Schedule of Covered Employees and Contributions, Multiemployer Plans

Total contributions to multiemployer plans and the related number of employees covered by these plans for the periods indicated were as follows:

	Multiemployer Plans
	Covered Employees		Contributions (in millions)
	Low	High	Pension		Other Multiemployer		Total
For the Three Months Ended September 30:
2020	1,452	1,469	$	7.2	$	1.7	$	8.9
2019	3,814	5,349	$	23.0	$	1.2	$	24.2
For the Nine Months Ended September 30:
2020	1,119	1,469	$	19.5	$	5.5	$	25.0
2019	1,626	5,349	$	51.7	$	4.0	$	55.7