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Stock-Based Compensation Plans and Employee Benefits (Restricted Stock Units Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2013
Restricted stock units
Dec. 31, 2012
Restricted stock units
Dec. 31, 2011
Restricted stock units
Dec. 31, 2013
Performance-based restricted stock units
Dec. 31, 2013
Performance based restricted stock units vesting on December 31, 2014
Dec. 31, 2013
Employees
Restricted stock units
Dec. 31, 2013
Employees
Amended restricted stock units that vested on January 1, 2012
Feb. 28, 2013
Employees
Service based restricted stock units vesting on February 11, 2013
Dec. 31, 2013
Employees
Annual incentive restricted stock units
Feb. 28, 2013
Employees
Annual incentive restricted stock units
Dec. 31, 2013
Employees
Performance-based restricted stock units
Dec. 31, 2013
Employees
Service based restricted stock units with specified vesting dates
Dec. 31, 2013
Company's chairman and chief executive officer
Restricted stock units
Dec. 31, 2013
Company's chairman and chief executive officer
Performance-based restricted stock units
Dec. 31, 2013
Company's chairman and chief executive officer
Service-based restricted stock units
Sep. 30, 2011
Executives and other officers
Market-condition based restricted stock units granted on December 19, 2008, modified and measured on July 1, 2011
Dec. 31, 2013
Executives and other officers
Market-condition based restricted stock units granted on December 19, 2008, modified and measured on July 1, 2011
Dec. 31, 2013
Minimum
Employees
Performance-based restricted stock units
Dec. 31, 2013
Minimum
Employees
Service-based restricted stock units
Dec. 31, 2013
Minimum
Employees
Service based restricted stock units with specified vesting dates
Dec. 31, 2013
Maximum
Employees
Performance-based restricted stock units
Dec. 31, 2013
Maximum
Employees
Service-based restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                              
Total fair value of restricted stock units vested   $ 31.6 $ 29.1 $ 15.5                                      
Vested (in shares) 1,678,961 3,271,000         3,271,272 1,719,304   195,588 164,685                        
Granted (in shares)   795,000             185,720         600,000 313,334                
Non-vested, outstanding (in shares)   2,779,000 5,276,000     195,547           195,588 90,666     600,000   1,696,053         196,902
Performance measurement period                                     1 year     2 years  
Vesting percentage                                     0.00%     200.00%  
Percentage of original units granted equal to amended units                                 75.00%            
Risk-free interest rate         0.26%                         0.092%          
Expected stock price volatility         50.44%                         57.75%          
Vesting term                                       1 year 3 years   3 years