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Share-Based Compensation (Narrative) (Details)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Nov. 14, 2016
$ / shares
shares
Sep. 12, 2016
$ / shares
shares
Aug. 02, 2016
shares
May 26, 2016
shares
May 09, 2016
$ / shares
shares
May 31, 2014
shares
Jun. 30, 2014
shares
Dec. 31, 2016
USD ($)
director
shares
Dec. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
director
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Share-based Compensation, Aggregate Disclosures:                      
Number of shares authorized for grant under 2005 Long-Term Equity Incentive Plan (in shares)               5,000,000.0   5,000,000.0  
Number of additional shares authorized (in shares)             1,800,000.0        
Maximum number of shares per participant, 12 month period (in shares)           1,000,000.0 2,500,000.0        
Extension of plan term             10 years        
Share-based compensation costs charged against income | $               $ 2.4 $ 2.1 $ 6.3 $ 7.1
Tax benefit recognized from share-based compensation expense | $               1.3 $ 0.7 2.5 2.5
Unrecognized compensation costs related to nonvested awards | $               $ 10.5   $ 10.5  
Unrecognized compensation costs related to nonvested awards, weighted average period for recognition                   10 months 24 days  
Total fair value of vested shares | $                   $ 6.0 6.6
Cash received from exercise of stock options | $                   3.4 6.6
Tax benefit realized from exercise of stock options | $                   $ 1.8 $ 3.5
Shares available for issuance under the Plan (in shares)               2,400,000   2,400,000  
Stock options granted (in shares)                   264,300 208,200
Restricted Shares                      
Board of directors, number of directors | director               6   6  
Options, Additional Disclosures:                      
Options granted, weighted-average grant-date fair value (in USD per share) | $ / shares                   $ 21.75 $ 17.24
Options exercised, aggregate intrinsic value | $                   $ 2.4  
Restricted Stock Units (RSUs)                      
Share-based Compensation, Aggregate Disclosures:                      
Shares issued in period (in shares)                   94,718 153,603
Granted in period to each independent director (in shares)     1,896   49,064         68,400 266,100
Award vesting period         3 years            
Restricted Shares                      
Period following director's term in which RSUs may be settled     6 months                
Granted, weighted-average grant-date fair value (in USD per share) | $ / shares                   $ 55.44 $ 42.41
Stock Options                      
Share-based Compensation, Aggregate Disclosures:                      
Stock options granted (in shares)         224,843            
Award vesting period         3 years            
Expected term in years         10 years            
Stock options granted, exercise price (in USD per share) | $ / shares         $ 57.18            
Stock Options | Minimum                      
Share-based Compensation, Aggregate Disclosures:                      
Award vesting period                   3 years  
Stock Options | Maximum                      
Share-based Compensation, Aggregate Disclosures:                      
Award vesting period                   5 years  
Options, Additional Disclosures:                      
Award exercisability period, from date of grant                   10 years  
Restricted Shares | Minimum                      
Share-based Compensation, Aggregate Disclosures:                      
Award vesting period                   3 years  
Restricted Shares | Maximum                      
Share-based Compensation, Aggregate Disclosures:                      
Award vesting period                   5 years  
Chief Financial Officer | Restricted Stock Units (RSUs)                      
Share-based Compensation, Aggregate Disclosures:                      
Granted in period to each independent director (in shares)   5,012                  
Award vesting period         3 years            
Chief Financial Officer | Stock Options                      
Share-based Compensation, Aggregate Disclosures:                      
Stock options granted (in shares)   25,746                  
Expected term in years   10 years                  
Stock options granted, exercise price (in USD per share) | $ / shares   $ 47.39                  
Senior Vice President | Restricted Stock Units (RSUs)                      
Share-based Compensation, Aggregate Disclosures:                      
Granted in period to each independent director (in shares) 2,664                    
Award vesting period 3 years                    
Senior Vice President | Stock Options                      
Share-based Compensation, Aggregate Disclosures:                      
Stock options granted (in shares) 13,683                    
Expected term in years 10 years                    
Stock options granted, exercise price (in USD per share) | $ / shares $ 50.06                    
Employee | Restricted Shares                      
Share-based Compensation, Aggregate Disclosures:                      
Award vesting period                   3 years  
Director | Restricted Stock Units (RSUs)                      
Share-based Compensation, Aggregate Disclosures:                      
Granted in period to each independent director (in shares)       346              
Restricted Shares                      
Number of common shares into which each RSU may be converted (in shares)     1                
Director | Restricted Shares                      
Share-based Compensation, Aggregate Disclosures:                      
Award vesting period                   1 year  
First year anniversary | Stock Options                      
Share-based Compensation, Aggregate Disclosures:                      
Annual award vesting percentage         33.30%            
First year anniversary | Chief Financial Officer | Stock Options                      
Share-based Compensation, Aggregate Disclosures:                      
Annual award vesting percentage   33.30%                  
First year anniversary | Senior Vice President | Stock Options                      
Share-based Compensation, Aggregate Disclosures:                      
Annual award vesting percentage 33.30%                    
Second year anniversary | Stock Options                      
Share-based Compensation, Aggregate Disclosures:                      
Annual award vesting percentage         33.30%            
Second year anniversary | Chief Financial Officer | Stock Options                      
Share-based Compensation, Aggregate Disclosures:                      
Annual award vesting percentage   33.30%                  
Second year anniversary | Senior Vice President | Stock Options                      
Share-based Compensation, Aggregate Disclosures:                      
Annual award vesting percentage 33.30%                    
Third year anniversary | Stock Options                      
Share-based Compensation, Aggregate Disclosures:                      
Annual award vesting percentage         33.30%            
Third year anniversary | Chief Financial Officer | Stock Options                      
Share-based Compensation, Aggregate Disclosures:                      
Annual award vesting percentage   33.30%                  
Third year anniversary | Senior Vice President | Stock Options                      
Share-based Compensation, Aggregate Disclosures:                      
Annual award vesting percentage 33.30%