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Share-based Compensation Overall (Details) - USD ($)
shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Expense $ 11.1 $ 10.7 $ 11.3
Adjustments to Additional Paid in Capital, Income Tax Deficiency from Share-based Compensation   $ (1.7) (0.9)
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 5.8    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 2 years 22 days    
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 1,250 1,110  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 2.4    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 2 years 161 days    
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Nonvested, shares 330 330  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 2.6    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 1 year 303 days    
Performance units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Nonvested, shares   80  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 0.8    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 1 year 230 days    
Leveraged Restricted Share Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Nonvested, shares 0 10  
2017 Omnibus Equity Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 1,700    
Nonvested, shares 10    
Omnibus Equity Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 3,350    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 1,200    
Omnibus Equity Plan [Member] | Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Nonvested, shares 320    
Omnibus Equity Plan [Member] | Performance units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Nonvested, shares 80    
Stock Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 3,420    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 60    
Additional Paid-in Capital [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Adjustments to Additional Paid in Capital, Income Tax Deficiency from Share-based Compensation   $ (1.7) $ (0.9)