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Stock Compensation Plans (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Sep. 30, 2014
2006 Plan [Member]
Sep. 30, 2014
Performance Shares [Member]
Sep. 30, 2013
Performance Shares [Member]
Dec. 31, 2013
Performance Shares [Member]
Sep. 30, 2014
Stock Appreciation Rights (SARs) [Member]
Sep. 30, 2013
Stock Appreciation Rights (SARs) [Member]
Sep. 30, 2014
Stock Appreciation Rights (SARs) [Member]
Sep. 30, 2013
Stock Appreciation Rights (SARs) [Member]
Apr. 24, 2014
Restricted Stock [Member]
Sep. 30, 2014
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Common stock, shares authorized 150,000,000   150,000,000   150,000,000 10,000,000                  
Weighted average grant-date fair value of performance awards granted, dollars per share             $ 53.87 $ 51.01       $ 13.11 $ 22.40    
Shares awarded             887,198                
Share-based compensation cost not yet recognized             $ 3.5     $ 10.0   $ 10.0      
Share-based compensation, recognition period of unrecognized compensation cost, years             1 year         2 years      
Stock compensation expense (22.8) 5.9 (10.8) 34.2           1.3 1.1 3.9 3.4   1.1
Weighted average remaining contractual life of SSARs outstanding, years                       4 years      
Total fair value of SSARs vested                       4.4      
Number of shares not vested             3,572,457   2,808,519 692,007   692,007      
Total intrinsic value of outstanding SSARs                   5.1   5.1      
Total intrinsic value of SSARs exercised                       $ 0.3      
Weighted-average period for compensation cost expected to be recognized, years                             3 years
Restricted stock issued, shares                           18,846  
Restricted common stocks issued, shares                           14,907  
Shares available for grant, shares           2,500,000