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Employee Incentive Plans, Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of common shares authorized for issuance under Equity Incentive Plan 2,722,222      
Number of common shares available for additional awards under Equity Incentive Plan 922,995      
Non-cash compensation expense $ 11.7 $ 9.3 $ 6.8  
Recognized tax benefit relating to non-cash compensation expense $ 4.4 $ 3.5 2.5  
Fully-vested options outstanding 1,543 16,645    
Exercise price of options to purchase common stock   $ 80.01    
Remaining contractual life of options outstanding 3 months 15 months    
Stock options granted 0      
Stock options exercised 15,102      
Issuance of common shares to non-employee directors $ 0.1 $ 0.2 $ 0.2  
Shares Paid for Tax Withholding for Share Based Compensation 36,055 37,009 33,696  
Cumulative Effect of New Accounting Principle in Period of Adoption [1]   $ 0.7    
Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 year      
Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years      
Non-vested common shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 9,702      
Restricted stock units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 59,105      
Number of common share received by the employee on vesting of restricted stock unit 1      
EVA-Based Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 0      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years      
Non-cash compensation expense $ 0.3 0.9 $ 1.0  
Restricted Stock And Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Non-cash compensation expense 4.7 4.4 3.9  
Unrecognized Gross Compensation Costs (in millions of dollars) $ 5.9      
Expected Period (in years) Over Which the Remaining Gross Compensation Costs Will Be Recognized 1 year 8 months      
Cost Performance-Based Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 63,983      
Non-cash compensation expense $ 1.3 0.0 0.0  
Unrecognized Gross Compensation Costs (in millions of dollars) $ 3.4      
Expected Period (in years) Over Which the Remaining Gross Compensation Costs Will Be Recognized 2 years 2 months      
Cost Performance-Based Shares | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 0.00%      
Cost Performance-Based Shares | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 200.00%      
TSR-Based Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 95,974      
Non-cash compensation expense $ 5.4 4.0 1.9  
Unrecognized Gross Compensation Costs (in millions of dollars) $ 6.3      
Expected Period (in years) Over Which the Remaining Gross Compensation Costs Will Be Recognized 1 year 7 months      
TSR-Based Performance Shares | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 0.00%      
TSR-Based Performance Shares | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 200.00%      
2016 LTI Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of common shares authorized for issuance under Equity Incentive Plan 1,045,000      
2016 Equity and Performance Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 1,900      
Additional Paid In Capital        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Issuance of common shares to non-employee directors $ 0.1 0.2 $ 0.2  
Cumulative Effect of New Accounting Principle in Period of Adoption [1]   0.8    
New Accounting Pronouncement, Early Adoption, Effect [Member] | Accounting Standards Update 2016-09 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Cumulative Effect of New Accounting Principle in Period of Adoption       $ 0.7
New Accounting Pronouncement, Early Adoption, Effect [Member] | Accounting Standards Update 2016-09 [Member] | Additional Paid In Capital        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Cumulative Effect of New Accounting Principle in Period of Adoption   $ 0.8    
[1] See Note 5 and Note 8 for discussion of our adoption of ASU 2016-09 (as defined in Note 1).