Fair Value (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017
Fair Value [Abstract]
Available-For-Sale Securities, Number Of Debt Securities With Unobservable Inputs	1	1
Available-For-Sale Securities, Number Of Equity Securities With Unobservable Inputs		1
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount	$ 0.0
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount	$ 0.0
Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Instruments Classified In Shareholders' Equity, Number Of Transfers Out Of Level 3	0
Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Number Of Transfers Out Of Level 3		1