Employee Benefit Plans (Reconciliation of the Beginning and Ending Balances for Investments) (Details) - Level 3 - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Change in Plan Assets:
Beginning balance	$ 1.6	$ 2.0
Actual return on plan assets held	0.0	(0.5)
Foreign currency changes		0.1
Ending balance	$ 1.6	$ 1.6