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Earnings Per Share Earnings Per Share (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Earnings Per Share, Basic and Diluted, by Common Class [Line Items]      
Net income $ 119.3 $ 119.8 $ 157.1
Weighted average number of shares outstanding - basic 28,289,118 29,912,063 32,120,578
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 311,875 292,801 419,140
Weighted average number of shares outstanding - diluted 28,600,993 30,204,864 32,539,718
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 0 111,386 0
Stock Options [Member]      
Earnings Per Share, Basic and Diluted, by Common Class [Line Items]      
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 27,033 36,568 77,482
Performance shares units [Member]      
Earnings Per Share, Basic and Diluted, by Common Class [Line Items]      
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 237,999 230,831 285,550
Restricted stock units (RSUs)      
Earnings Per Share, Basic and Diluted, by Common Class [Line Items]      
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 46,843 25,402 56,108