Employee Benefit Plans (Reconciliation of the Beginning and Ending Balances for Investments) (Details) - Level 3 - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Change in Plan Assets:
Beginning balance	$ 1.5	$ 1.5
Purchases and sales net	(0.7)
Actual return on plan assets held	1.4	(0.1)
Foreign currency changes	(0.2)	0.1
Ending balance	$ 2.0	$ 1.5