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Employee Stock and Incentive Plans - Share-Based Compensation Expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-Based Compensation Expense [Line Items]      
Share-Based Compensation Expense $ 3.1 $ 3.2 $ 3.1
Income Tax Benefit 0.9 0.9 0.9
Capitalized Share-Based Compensation Costs $ 0.0 0.0 0.0
Performance Shares [Member]      
Share-Based Compensation Expense [Line Items]      
Performance Period (Years) 3 years    
Share-Based Compensation Expense $ 2.3 2.3 2.1
Unrecognized Compensation Cost $ 2.2    
Weighted-Average Period for Recognition (Years/Months) 1 year 7 months 6 days    
Restricted Stock Units [Member]      
Share-Based Compensation Expense [Line Items]      
Performance Period (Years) 3 years    
Share-Based Compensation Expense $ 0.8 $ 0.9 $ 1.0
Unrecognized Compensation Cost $ 0.9