Equity Incentive Programs (Deferred Stock Unit Activity) (Details) - Deferred Stock Units (DSUs) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Units
Outstanding, Units, beginning balance (in shares)	236,561
Granted, Units (in shares)	72,464
Dividend equivalents granted, Units (in shares)	36,309
Settled, Units (in shares)	(30,676)
Outstanding, Units, ending balance (in shares)	314,658	236,561
Weighted- Average Grant Date Fair Value Per Share
Outstanding, beginning of year, Weighted-Average Grant Date Fair Value Per Share (in dollars per share)	$ 19.40
Granted, Weighted-Average Grant Date Fair Value Per Share (in dollars per share)	12.32
Dividend equivalents granted, Weighted-Average Grant Date Fair Value Per Share (in dollars per share)	8.60
Settled, Weighted-Average Grant Date Fair Value Per Share (in dollars per share)	22.53
Outstanding, end of year, Weighted-Average Grant Date Fair Value Per Share (in dollars per share)	$ 16.22	$ 19.40
Number of shares each deferred stock unit will convert to upon the earlier of the separation date of the grantee or the second anniversary of the grant date	1
Compensation expense recognized	$ 0.9	$ 0.9	$ 0.9