Stock-Based Compensation (Stock Option Activity) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Option exercise price grouping [Member]
Intrinsic Value of Options Exercised [Abstract]
Intrinsic value of options exercised	$ 0.4	$ 0.1	$ 0.1
Option grants excluding options granted at discount [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning Balance, Options, Outstanding, Underlying Shares	40,685	41,685	46,001
Granted, Underlying Shares	0	0	0
Canceled, Underlying Shares	0	0	0
Exercised, Underlying Shares	(3,416)	(1,000)	(4,316)
Ending Balance, Options, Outstanding, Underlying Shares	37,269	40,685	41,685
Options, Weighted Average Exercise Price [Abstract]
Beginning Balance, Options, Outstanding, Weighted Average Exercise Price	$ 57.28	$ 57.28	$ 57.28
Granted, Weighted Average Exercise Price	0	0	0
Canceled, Weighted Average Exercise Price	0	0	0
Expected exercise price:	57.28	57.28	57.28
Ending Balance, Options, Outstanding, Weighted Average Exercise Price	$ 57.28	$ 57.28	$ 57.28
Options, Exercisable, Number of Shares and Weighted Average Exercise Price [Abstract]
Options exercisable - end of year, Underlying Shares	37,269	40,685	41,685
Options exercisable - end of year, Weighted Average Exercise Price	$ 57.28	$ 57.28	$ 57.28