Shareholders' Equity and Stock Incentive Plans (Summary of SARs Activity) (Details) - Stock Appreciation Rights (SARs) [Member] - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
SARs, Outstanding, Beginning of period	1,330,924	714,238
SARs, Granted	770,775	616,686
SARs, Exercised	0	0
SARs, Forfeitures	0	0
SARs, Expirations	0	0
SARs, Outstanding, End of period	2,101,699	1,330,924
SARs, Vested, End of Period	919,800	543,018
SARs, Exercisable, End of Period	0	0
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Weighted Average Exercise Price [Roll Forward]
Weighted Average Exercise Prices, Outstanding, Beginning of Period	$ 21.35	$ 27.12
Weighted Average Exercise Prices, Granted	10.98	14.67
Weighted Average Exercise Prices, Exercised	0.00	0.00
Weighted Average Exercise Prices, Forfeitures	0.00	0.00
Weighted Average Exercise Prices, Expired	0.00	0.00
Weighted Average Exercise Prices, Outstanding, End of Period	17.55	21.35
Weighted Average Exercise Prices, Vested, End of Period	24.34	27.18
Weighted Average Exercise Prices, Exercisable, End of Period	$ 24.34	$ 27.18
Weighted Average Remaining Life, Outstanding, End of Period	5 years 1 month 20 days	5 years 1 month 6 days
Weighted Average Remaining Life, Exercisable, End of Period	3 years 2 months 26 days	3 years 3 months 18 days
Aggregate Intrinsic Value, Outstanding, End of Period	$ 1.1	$ 0.7
Aggregate Intrinsic Value, Exercisable, End of Period	$ 0.0	$ 0.0