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Stock Incentive Plan (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Jan. 22, 2020
Dec. 31, 2019
Apr. 25, 2019
Feb. 29, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Common stock, shares issuable (in shares)   150,000,000     150,000,000 150,000,000  
Compensation cost related to unearned performance awards   $ 24.0     $ 24.0    
Total stock compensation expense         41.7 $ 46.6 $ 38.4
Excess tax benefit of stock awards         $ 2.7 $ 1.6 $ 0.1
Shares available for grant (in shares)   3,581,614     3,581,614    
Long Term Incentive Plan | Minimum              
Target award percentages         33.00%    
Long Term Incentive Plan | Maximum              
Target award percentages         200.00%    
Performance Shares              
Shares awarded (in shares)         542,180    
Recognition period   1 year 6 months          
Weighted average grant-date fair value of performance awards granted (in dollars per share)         $ 61.01 $ 71.40 $ 61.94
Number of shares not vested (in shares)   932,182     932,182 938,862  
Shares earned (in shares)         503,514    
Waived Stock Award [Member]              
Share-based Payment Arrangement, Accelerated Cost             $ 4.8
Restricted Stock Units (RSUs)              
Shares awarded (in shares)         165,160    
Compensation cost related to unearned performance awards   $ 12.6     $ 12.6    
Recognition period   1 year 6 months          
Weighted average grant-date fair value of performance awards granted (in dollars per share)         $ 61.01 $ 63.99 $ 61.99
Number of shares not vested (in shares)   396,529     396,529 352,975  
Shares earned (in shares)         113,182    
Stock Appreciation Rights (SARs)              
Vesting period         4 years    
Compensation cost related to unearned performance awards   $ 3.9     $ 3.9    
Recognition period   2 years 6 months          
Weighted average grant-date fair value of performance awards granted (in dollars per share)         $ 11.34 $ 12.88 $ 11.45
SSAR Expiration Period         7 years    
Total stock compensation expense         $ 2.4 $ 2.4 $ 3.0
Weighted average remaining contractual life of SSARs outstanding, in years         4 years 7 months 6 days    
Total fair value of SSARs vested         $ 3.1    
Number of shares not vested (in shares)   550,050     550,050    
Total intrinsic value of outstanding SSARs   $ 8.1     $ 8.1    
Total intrinsic value of exercisable of SSARs   $ 4.3     4.3    
Total intrinsic value of SSARs exercised         $ 12.7    
SSARs granted (in shares)         243,600    
Restricted Stock              
Total stock compensation expense         $ 1.4    
Weighted-average period for compensation cost expected to be recognized, in years         1 year    
Restricted common stocks issued (in shares)     19,386        
Restricted common stocks issued after shares withheld for taxes (in shares)     14,105        
Long Term Incentive Plan              
Performance period         3 years    
2006 Plan              
Common stock, shares issuable (in shares)   10,000,000     10,000,000    
Subsequent Event [Member]              
Shares earned (in shares)       492,314      
Share-based compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Issued       302,009      
Share-based compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Shares Withheld for Taxes       190,305      
Subsequent Event [Member] | Performance Shares              
Shares awarded (in shares) 212,720            
Subsequent Event [Member] | Restricted Stock Units (RSUs)              
Shares awarded (in shares) 95,820            
Subsequent Event [Member] | Stock Appreciation Rights (SARs)              
SSARs granted (in shares) 187,100