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Stock Incentive Plan (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 8 Months Ended 12 Months Ended
Jan. 23, 2018
Apr. 28, 2016
Mar. 31, 2017
Dec. 31, 2014
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Common stock, shares issuable (in shares)         150,000,000 150,000,000  
Compensation cost related to unearned performance awards         $ 35.5    
Recognition period         2 years    
Total stock compensation expense         $ 38.4 $ 18.4 $ 12.5
Excess tax benefit of stock awards         $ 0.1 $ 0.1 $ 0.7
Shares available for grant (in shares)         4,053,539    
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)         539,598    
Weighted average grant-date fair value of performance awards granted (in dollars per share)         $ 61.94 $ 47.93 $ 45.54
Number of shares not vested (in shares)         1,645,078 1,982,120  
Shares earned (in shares)         0    
Shares issued subsequent to year-end (in shares)         0    
Waived Stock Award [Member]              
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost     $ 4.8        
Restricted Stock Units (RSUs)              
Performance period         3 years    
Shares awarded (in shares)         111,166    
Compensation cost related to unearned performance awards         $ 6.9    
Recognition period         2 years    
Weighted average grant-date fair value of performance awards granted (in dollars per share)         $ 61.99 $ 45.10  
Number of shares not vested (in shares)         237,468 222,730  
Shares earned (in shares)         88,645    
Stock Appreciation Rights (SARs)              
Vesting period         4 years    
Compensation cost related to unearned performance awards         $ 4.3    
Recognition period         2 years    
Weighted average grant-date fair value of performance awards granted (in dollars per share)         $ 11.45 $ 7.98 $ 7.41
SSAR Expiration Period         7 years    
Total stock compensation expense         $ 3.0 $ 3.8 $ 5.0
Weighted average remaining contractual life of SSARs outstanding, in years         5 years    
Total fair value of SSARs vested         $ 3.5    
Number of shares not vested (in shares)         712,150    
Total intrinsic value of outstanding SSARs         $ 20.1    
Total intrinsic value of exercisable of SSARs         7.3    
Total intrinsic value of SSARs exercised         $ 10.8    
SSARs granted (in shares)         286,200    
Restricted Stock              
Total stock compensation expense         $ 1.0    
Weighted-average period for compensation cost expected to be recognized, in years       1 year      
Restricted common stocks issued (in shares)   14,968          
Restricted common stocks issued after shares withheld for taxes (in shares)   12,066          
Long Term Incentive Plan              
Performance period         3 years    
2006 Plan              
Common stock, shares issuable (in shares)         10,000,000    
Subsequent Event | Performance Shares              
Shares awarded (in shares) 220,900            
Subsequent Event | Restricted Stock Units (RSUs)              
Shares awarded (in shares) 111,119            
Subsequent Event | Stock Appreciation Rights (SARs)              
SSARs granted (in shares) 157,700