Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Maximum annual contributions per employee, percent	50.00%
Employer matching contribution, percent of match	50.00%
Employer matching contribution, percent of employees' gross pay	6.00%
Defined contribution plan, cost recognized	$ 1.0	$ 1.0	$ 0.9
Health care cost trend rate assumed for next fiscal year	6.00%	6.40%
Ultimate health care cost trend rate	1.50%
Rolling measurement period For assumptions	7 years
Effect of one percentage point increase on accumulated postretirement benefit obligation	$ 0.1
Effect of one percentage point decrease on accumulated postretirement benefit obligation	0.1
Multiemployer Plans, Pension | Other Long-Term Liabilities
Defined Benefit Plan Disclosure [Line Items]
Employee-related liabilities	1.1	$ 1.3
Multiemployer Plans, Pension | Other Current Liabilities
Defined Benefit Plan Disclosure [Line Items]
Employee-related liabilities	0.2	$ 0.2
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Unrecognized loss	0.4
Expected contributions in current fiscal year	0.7
Other Postretirement Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Unrecognized loss	$ 0.1