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Share-Based Compensation Plans - Narrative (Details)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Jul. 11, 2014
employee
Jan. 31, 2016
director
Jun. 30, 2016
USD ($)
Dec. 31, 2016
$ / shares
shares
Dec. 31, 2015
$ / shares
shares
Dec. 31, 2014
employee
$ / shares
Dec. 31, 2013
employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares authorized, not yet granted (in shares)       2,400,000.0      
Number of employees affected by change in policy | employee 130            
Expense recognized | $     $ 4.2        
Employees              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Deferred compensation plan, stock units held (shares)       234,426 302,041    
Director              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Deferred compensation plan, stock units held (shares)       34,200 54,050    
Deferred Stock Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period         1 year    
The weighted-average grant-date fair value (in dollars per share) | $ / shares       $ 29.41 $ 32.79 $ 24.70  
Restricted Stock Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Weighted-average fair value per share at issuance date (in dollars per share) | $ / shares       $ 29.06 $ 27.09 $ 27.91  
Discount percent       3.00% 3.00% 3.00%  
Internal Metric Performance Share Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Performance period       2 years      
Performance Shares PSU              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of employees affected by change in policy | employee           100 100
Performance period         3 years 3 years  
Increase percent       25.00%      
75th Percentile       75.00%      
Reduction percent       25.00%      
25th Percentile       25.00%      
Performance Shares PSU | Minimum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Percent of an employees award       0.00% 0.00% 0.00%  
Performance Shares PSU | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Percent of an employees award       200.00% 200.00% 200.00%  
PSUs Granted in 2014              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period       3 years 3 years 3 years  
Market Share Units MSU              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Performance period         3 years 3 years  
Less than percent of initial price         50.00%    
Market Share Units MSU | Minimum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Percent of an employees award         0.00% 0.00%  
Market Share Units MSU | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Percent of an employees award         150.00% 150.00%  
Stock Options | Employees              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period       6 years      
Stock Options | Director              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period       10 years      
Executive Leadership and Board of Directors Restructuring | Severance Costs | Director              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of positions eliminated | director   2          
Share-based Compensation Award, Tranche Three | Performance Shares PSU | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Performance period       3 years      
Share-based Compensation Award, Tranche Two | Performance Shares PSU | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Performance period       2 years      
Share-based Compensation Award, Tranche One | Performance Shares PSU | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Performance period       1 year