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Stock-Based Employee Compensation (Other Equity) (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based awards conversion ratio 1    
Number of Awards      
Non-vested share units at January 1, 2016 (Share Units) | shares 820,649    
Granted (Share Units) | shares 376,744    
Vested (Share Units) | shares (333,733)    
Canceled (Share Units) | shares (115,144)    
Non-vested share units expected to vest as of December 31, 2016 (Share Units) | shares 748,516 820,649  
Weighted-Average Grant Date Fair Value      
Non-vested share units at January 1, 2016 (Price per Share) $ 54.98    
Granted (Price per Share) 64.51 $ 73.98 $ 54.60
Vested (Price per Share) 48.91    
Canceled (Price per Share) 58.45    
Non-vested share units expected to vest as of December 31, 2016 (Price per Share) 61.95 54.98  
Weighted-average estimated fair value of restricted stock units granted (Price per Share) $ 64.51 $ 73.98 $ 54.60
Fair value of shares released on vesting of restricted stock units | $ $ 23.2 $ 27.6 $ 20.7
Total unrecognized compensation cost | $ $ 13.7    
Weighted-average period of unrecognized compensation cost to be recognized (Years) 1 year 30 days    
Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based awards conversion ratio 1    
Number of Awards      
Non-vested share units at January 1, 2016 (Share Units) | shares 504,211    
Granted (Share Units) | shares 182,464   63,771
Vested (Share Units) | shares (253,509)    
Canceled (Share Units) | shares (91,014)    
Non-vested share units expected to vest as of December 31, 2016 (Share Units) | shares 342,152 504,211  
Weighted-Average Grant Date Fair Value      
Non-vested share units at January 1, 2016 (Price per Share) $ 53.57    
Granted (Price per Share) 65.83 $ 71.36 $ 56.72
Vested (Price per Share) 52.25    
Canceled (Price per Share) 50.99    
Non-vested share units expected to vest as of December 31, 2016 (Price per Share) 61.78 53.57  
Weighted-average estimated fair value of restricted stock units granted (Price per Share) $ 65.83 $ 71.36 $ 56.72
Fair value of shares released on vesting of restricted stock units | $ $ 16.9 $ 18.3 $ 0.4
Maximum actual number of shares underlying each performance share award as a percentage of target performance shares 200.00%   200.00%
Total unrecognized compensation cost | $ $ 7.9    
Weighted-average period of unrecognized compensation cost to be recognized (Years) 1 year 22 days    
Restricted Stock      
Number of Awards      
Granted (Share Units) | shares 132,228    
Weighted-Average Grant Date Fair Value      
Maximum actual number of shares underlying each performance share award as a percentage of target performance shares 200.00%    
Senior Officers | Restricted Stock      
Number of Awards      
Non-vested share units at January 1, 2016 (Share Units) | shares 0    
Granted (Share Units) | shares 132,228    
Vested (Share Units) | shares 0    
Canceled (Share Units) | shares 0    
Non-vested share units expected to vest as of December 31, 2016 (Share Units) | shares 132,228 0  
Weighted-Average Grant Date Fair Value      
Non-vested share units at January 1, 2016 (Price per Share) $ 0.00    
Granted (Price per Share) 66.93    
Vested (Price per Share) 0.00    
Canceled (Price per Share) 0.00    
Non-vested share units expected to vest as of December 31, 2016 (Price per Share) 66.93 $ 0.00  
Weighted-average estimated fair value of restricted stock units granted (Price per Share) $ 66.93    
Total unrecognized compensation cost | $ $ 1.5    
Weighted-average period of unrecognized compensation cost to be recognized (Years) 1 month 35 days