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Stock Compensation Plans (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Apr. 25, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common stock, shares authorized (in shares) 150,000,000   150,000,000   150,000,000   150,000,000
Total stock compensation expense     $ 8.1 $ 10.5 $ 33.3 $ 33.3  
2006 Long Term Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common stock, shares authorized (in shares) 10,000,000   10,000,000   10,000,000    
Shares available for grant (in shares) 3,500,240   3,500,240   3,500,240    
Performance Awards              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Weighted average grant-date fair value of performance awards granted (in dollars per share)         $ 61.01 $ 71.40  
Shares awarded (in shares)         542,180    
Share-based compensation cost not yet recognized $ 37.0   $ 37.0   $ 37.0    
Share-based compensation, recognition period of unrecognized compensation cost, years 2 years            
Restricted Stock Unit Awards              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Weighted average grant-date fair value of performance awards granted (in dollars per share)         $ 61.01 $ 63.99  
Shares awarded (in shares)         165,160    
Share-based compensation cost not yet recognized $ 15.4   15.4   $ 15.4    
Share-based compensation, recognition period of unrecognized compensation cost, years 1 year 6 months            
Shares received for every restricted stock unit award given         1    
Stock-Settled Appreciation Rights              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation cost not yet recognized $ 4.5   $ 4.5   $ 4.5    
Share-based compensation, recognition period of unrecognized compensation cost, years 2 years 6 months            
Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares awarded (in shares)   19,386          
Shares awarded after shares with held for taxes (in shares)   14,105          
Total stock compensation expense         $ 1.4    
Vesting Year One | Restricted Stock Unit Awards              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting percentage         33.33%    
Vesting Year Two | Restricted Stock Unit Awards              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting percentage         33.33%    
Vesting Year Three | Restricted Stock Unit Awards              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting percentage         33.33%