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Employee Incentive Plans, Long term Incentive Plans (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
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   2,722,222    
Number of common shares available for additional awards under Equity Incentive Plan 840,693   840,693    
Non-cash compensation expense $ 1.4 $ 1.6 $ 5.9 $ 5.2  
Stock Options          
Fully-vested options outstanding 20,791   20,791   20,791
Exercise price of options to purchase common stock $ 80.01   $ 80.01   $ 80.01
Remaining contractual life of options outstanding     3 years 6 months   4 years 3 months
Grant date fair value of options outstanding     $ 39.90   $ 39.90
Stock options granted     0    
Stock options forfeited     0    
Stock options exercised     0    
Vested Stock          
Issuance of common shares to non-employee directors     0.2 0.2  
Common shares withheld and canceled     40,075 45,801  
Fabricated Products
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Non-cash compensation expense 0.5 0.4 1.7 1.5  
All Other
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Non-cash compensation expense 0.9 1.2 4.2 3.7  
Non-vested common shares
         
Summary of Activity          
Outstanding at December 31, 2012, Shares     158,684    
Outstanding at December 31, 2012, Weighted-Average Grant-Date Fair Value per Share     $ 42.47    
Granted, shares     76,336 92,949  
Granted, Weighted-Average Grant-Date Fair Value per Share     $ 58.65 $ 45.03  
Vested, shares     (90,233) (134,746)  
Vested, Weighted-Average Grant-Date Fair Value per Share     $ 42.31 $ 24.30  
Forfeited, shares     (820)    
Forfeited, Weighted-Average Grant-Date Fair Value per Share     $ 53.00    
Canceled, Shares     0    
Canceled, Weighted-Average Grant-Date Fair Value per Share     $ 0    
Outstanding at September 30, 2013, Shares 143,967   143,967    
Outstanding at September 30, 2013, Weighted-Average Grant-Date Fair Value per Share $ 51.09   $ 51.09    
Restricted stock units (RSUs)
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of common shares received by the employee on vesting of restricted stock unit     1    
Summary of Activity          
Outstanding at December 31, 2012, Shares     5,183    
Outstanding at December 31, 2012, Weighted-Average Grant-Date Fair Value per Share     $ 43.99    
Granted, shares     2,600 2,486  
Granted, Weighted-Average Grant-Date Fair Value per Share     $ 57.70 $ 44.46  
Vested, shares     (2,311) (3,375)  
Vested, Weighted-Average Grant-Date Fair Value per Share     $ 42.74 $ 25.77  
Forfeited, shares     0    
Forfeited, Weighted-Average Grant-Date Fair Value per Share     $ 0    
Canceled, Shares     0    
Canceled, Weighted-Average Grant-Date Fair Value per Share     $ 0    
Outstanding at September 30, 2013, Shares 5,472   5,472    
Outstanding at September 30, 2013, Weighted-Average Grant-Date Fair Value per Share $ 51.03   $ 51.03    
Service-based non-vested common shares and restricted stock units
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Non-cash compensation expense 0.9 0.7 3.4 3.1  
Unrecognized gross compensation costs, by award type 4.6   4.6    
Expected period (in years) over which the remaining gross compensation costs will be recognized, by award type     1 year 7 months 6 days    
Performance shares
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance award vesting period, years     3 years    
Non-cash compensation expense 0.5 0.9 2.5 2.1  
Unrecognized gross compensation costs, by award type $ 7.1   $ 7.1    
Expected period (in years) over which the remaining gross compensation costs will be recognized, by award type     2 years 1 month 6 days    
Summary of Activity          
Outstanding at December 31, 2012, Shares     583,950    
Outstanding at December 31, 2012, Weighted-Average Grant-Date Fair Value per Share     $ 41.78    
Granted, shares     175,317 215,579  
Granted, Weighted-Average Grant-Date Fair Value per Share     $ 57.75 $ 44.47  
Vested, shares     (34,192) (7,952)  
Vested, Weighted-Average Grant-Date Fair Value per Share     $ 34.84 $ 18.89  
Forfeited, shares     0    
Forfeited, Weighted-Average Grant-Date Fair Value per Share     $ 0    
Canceled, Shares     (162,521)    
Canceled, Weighted-Average Grant-Date Fair Value per Share     $ 34.58    
Outstanding at September 30, 2013, Shares 562,554   562,554    
Outstanding at September 30, 2013, Weighted-Average Grant-Date Fair Value per Share $ 49.26   $ 49.26