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Stock Compensation Plans (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 3 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Mar. 31, 2014
2006 Plan [Member]
Mar. 31, 2014
Performance Shares [Member]
Mar. 31, 2013
Performance Shares [Member]
Dec. 31, 2013
Performance Shares [Member]
Mar. 31, 2014
Stock Appreciation Rights (SARs) [Member]
Mar. 31, 2013
Stock Appreciation Rights (SARs) [Member]
Mar. 31, 2014
Restricted Stock [Member]
Apr. 24, 2014
Subsequent Event [Member]
Restricted Stock [Member]
Jun. 30, 2014
Subsequent Event [Member]
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Common stock, shares authorized 150,000,000   150,000,000 10,000,000                
Weighted average grant-date fair value of performance awards granted, dollars per share         $ 53.93 $ 50.65   $ 13.13 $ 22.22      
Shares awarded         864,600              
Share-based compensation cost not yet recognized         $ 49.0     $ 12.5        
Share-based compensation, recognition period of unrecognized compensation cost, years         2 years     3 years        
Stock compensation expense 6.4 8.5           1.3 1.1     1.1
Weighted average remaining contractual life of SSARs outstanding, years               5 years        
Total fair value of SSARs vested               4.2        
Number of shares not vested         3,605,823   2,808,519 702,980        
Total intrinsic value of outstanding SSARs               9.8        
Total intrinsic value of exercisable SSARs               8.7        
Total intrinsic value of SSARs exercised               $ 0.1        
Weighted-average period for compensation cost expected to be recognized, years                   1 year    
Restricted stock issued, shares                     18,846  
Restricted common stocks issued                     14,907  
Shares available for grant       2,500,000