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Stock Incentive Plan (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended 0 Months Ended 12 Months Ended 2 Months Ended 12 Months Ended 2 Months Ended 12 Months Ended 2 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Apr. 25, 2013
Restricted Stock
Dec. 31, 2013
Restricted Stock
Dec. 31, 2013
Long Term Incentive Plan
Dec. 31, 2012
Long Term Incentive Plan
Dec. 31, 2013
Long Term Incentive Plan
Minimum
Dec. 31, 2013
Long Term Incentive Plan
Maximum
Feb. 28, 2014
Long Term Incentive Plan
Subsequent Event
Feb. 27, 2013
Long Term Incentive Plan
Subsequent Event
Dec. 31, 2013
2013 to 2015 Long Term Incentive Plan
Dec. 31, 2013
2012 to 2014 Long Term Incentive Plan
Dec. 31, 2013
2011 to 2013 Long Term Incentive Plan
Dec. 31, 2013
Performance Shares
Dec. 31, 2012
Performance Shares
Dec. 31, 2011
Performance Shares
Feb. 28, 2014
Performance Shares
Subsequent Event
Dec. 31, 2013
Margin Incentive Plan
Dec. 31, 2013
Margin Incentive Plan
Minimum
Dec. 31, 2013
Margin Incentive Plan
Maximum
Dec. 31, 2013
Stock Appreciation Rights (SARs)
Dec. 31, 2012
Stock Appreciation Rights (SARs)
Dec. 31, 2011
Stock Appreciation Rights (SARs)
Feb. 28, 2014
Stock Appreciation Rights (SARs)
Subsequent Event
Dec. 31, 2013
2006 Plan
Dec. 31, 2013
2006 Plan
Minimum
Dec. 31, 2013
2006 Plan
Maximum
Dec. 31, 2013
Director Restricted Stock Award Year One
Dec. 31, 2013
Director Restricted Stock Grants Year Two
Common stock, shares issuable 150,000,000 150,000,000                                               10,000,000        
Share-based Compensation, Percentage of Target Award Which Participant May Earn               33.00% 200.00%                     33.00% 300.00%                  
Weighted average grant-date fair value of performance awards granted                             $ 51.51 $ 52.11 $ 52.73         $ 21.10 $ 22.50 $ 22.26            
Shares earned under the performance period           622,018 748,137               622,018                              
Shares Issued in Period           473,499       368,497                                        
Shares Paid for Tax Withholding           274,638         226,721                                      
Shares awarded       17,171               1,103,494 29,158 8,042 1,151,944     432,300 11,250                      
Compensation cost related to unearned performance awards                             $ 33.7             $ 10.2                
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition                             2 years             3 years                
Stock compensation expense 34.9 37.0 24.6   0.9                                 4.7 3.8 2.6            
Weighted average remaining contractual life of SSARs outstanding, in years                                           4 years                
Total fair value of SSARs vested                                           3.6                
Number of shares not vested                             2,808,519 2,509,323           630,130                
Total intrinsic value of outstanding SSARs                                           14.2                
Total intrinsic value of exercisable SSARs                                           9.3                
Total intrinsic value of SSARs exercised                                           5.7                
Excess tax benefit of stock awards $ 11.4                                                          
SSARs granted                                           335,630     296,700          
Restricted common stocks issued       12,059                                                    
Shares available for grant 3,600,000                                                          
Weighted-average period for compensation cost expected to be recognized, in years         3 years                                                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period                                                   3 years 3 years 5 years    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years                                                       5 years 4 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term                                           5 years 6 months 5 years 6 months 5 years 6 months            
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate                                           0.90% 0.80% 1.90%            
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate                                           50.30% 51.00% 49.70%            
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate                                           0.80% 0.00% 0.00%