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Stock Compensation Plans (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
2 Months Ended 3 Months Ended 6 Months Ended
Apr. 23, 2015
Jun. 30, 2015
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common stock, shares authorized   150,000,000 150,000,000   150,000,000   150,000,000
Stock compensation expense     $ 5.0 $ 5.6 $ 7.4 $ 12.0  
2006 Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common stock, shares authorized   10,000,000.0 10,000,000.0   10,000,000.0    
Shares available for grant, shares   2,500,000 2,500,000   2,500,000    
Performance Shares [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Weighted average grant-date fair value of performance awards granted, dollars per share         $ 42.46 $ 53.93  
Shares awarded         717,900    
Share-based compensation cost not yet recognized   $ 17.9 $ 17.9   $ 17.9    
Share-based compensation, recognition period of unrecognized compensation cost, years         3 years    
Number of shares not vested   3,181,146 3,181,146   3,181,146   2,481,767
Restricted Stock Units (RSUs) [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Weighted average grant-date fair value of performance awards granted, dollars per share         $ 43.88    
Shares awarded         142,150    
Share-based compensation cost not yet recognized   $ 5.1 $ 5.1   $ 5.1    
Share-based compensation, recognition period of unrecognized compensation cost, years         3 years    
Number of shares not vested   141,000 141,000   141,000   0
Stock Appreciation Rights (SARs) [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Weighted average grant-date fair value of performance awards granted, dollars per share         $ 7.41 $ 13.13  
Share-based compensation cost not yet recognized   $ 8.4 $ 8.4   $ 8.4    
Share-based compensation, recognition period of unrecognized compensation cost, years         2 years    
Stock compensation expense     $ 1.2 $ 1.3 $ 2.5 $ 2.6  
Weighted average remaining contractual life of SSARs outstanding, years         5 years    
Total fair value of SSARs vested         $ 3.9    
Number of shares not vested   741,647 741,647   741,647    
Total intrinsic value of outstanding SSARs   $ 11.1 $ 11.1   $ 11.1    
Total intrinsic value of exercisable SSARS   $ 5.7 $ 5.7   5.7    
Total intrinsic value of SSARs exercised         $ 0.9    
Margin Growth Incentive Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares awarded         135,600    
Restricted Stock [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock compensation expense         $ 1.1    
Weighted-average period for compensation cost expected to be recognized, years   1 year     3 years    
Restricted stock issued, shares 22,095            
Restricted common stocks issued, shares 15,711