Compensation Related Costs, Retirement Benefits (Tables)

3 Months Ended

Mar. 31, 2020

Retirement Benefits [Abstract]

Retirement plan expense

Total employee retirement plan expense, which includes related administrative expenses, is as follows:

	Three Months Ended March 31,
	2020		2019
	(in millions)
Defined contribution plans	$	2.6	$	2.2
Multiemployer plan	0.4		0.5
	$	3.0	$	2.7