Profit Sharing And Savings Plan (Narrative) (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended			48 Months Ended
	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Required term of service to be eligible for plan match	six months of service and 500 hours				one year of service and 1,000 hours
Profit Sharing and Savings Plan
Defined Benefit Plan Disclosure [Line Items]
Voluntary contribution, minimum percent of employee pay		2.00%
Voluntary contribution, maximum percent of employee pay		50.00%
Percentage of employee contribution matched by employer		50.00%
Percent of employee pay eligible for matching contributions		6.00%
Employer matching contribution percentage maximum of pay		3.00%
Employer Matching Contribution		$ 2.7	$ 1.8	$ 0.7
Discretionary Employer Contribution		$ 56.8	$ 67.4	$ 43.2