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Share-based Compensation - Share-based Plans Narratives (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation expense	$ 8.6	$ 8.8	$ 4.6
Tax benefit related to share-based compensation	1.6	$ 2.7	$ 1.3
Share based compensation not yet recognized	$ 8.9
Recognition period for unrecognized share based compensation	1 year 8 months 12 days
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Shares outstanding (shares)	360,000	630,000
Share based compensation not yet recognized	$ 2.1
Recognition period for unrecognized share based compensation	2 years 4 months 24 days
Restricted stock and RSU's
Share-based Compensation Arrangement by Share-based Payment Award
Shares other than options outstanding unvested (shares)	190,000	220,000
Share based compensation not yet recognized	$ 4.7
Recognition period for unrecognized share based compensation	1 year 6 months
Performance units
Share-based Compensation Arrangement by Share-based Payment Award
Shares other than options outstanding unvested (shares)	70,000.00	40,000.00
Share based compensation not yet recognized	$ 2.1
Recognition period for unrecognized share based compensation	1 year 8 months 12 days
2017 Omnibus Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award
Number of shares authorized (shares)	1,700,000
2017 Omnibus Equity Plan \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Shares outstanding (shares)	220,000
2017 Omnibus Equity Plan \| Restricted stock and RSU's
Share-based Compensation Arrangement by Share-based Payment Award
Shares other than options outstanding unvested (shares)	200,000
2017 Omnibus Equity Plan \| Performance units
Share-based Compensation Arrangement by Share-based Payment Award
Shares other than options outstanding unvested (shares)	60,000.00
2009 Omnibus Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award
Number of shares authorized (shares)	3,350,000
2009 Omnibus Equity Plan \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Shares outstanding (shares)	150,000