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Employee Stock and Incentive Plans - Share-Based Compensation Expense (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-Based Compensation Expense $ 2.1 $ 1.6 $ 2.2
Income Tax Benefit 0.9 0.7 0.9
Capitalized Stock-Based Compensation Expense 0 0 0
Stock Options [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-Based Compensation Expense 0 0 0.1
Performance Shares [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-Based Compensation Expense 1.4 1.1 1.5
Unrecognized Compensation Cost 1.3    
Weighted Average Period for Recognition 1 year 8 months 12 days    
Restricted Stock Units [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-Based Compensation Expense 0.7 0.5 0.6
Unrecognized Compensation Cost $ 0.6    
Weighted Average Period for Recognition 1 year 8 months 12 days