XML 15 R46.htm IDEA: XBRL DOCUMENT v2.4.0.8
Stock-based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 0 Months Ended 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Supplemental Employee Incentive Plan IV
Mar. 31, 2013
Supplemental Employee Incentive Plan IV
Mar. 31, 2014
Restricted Stock Awards
Mar. 31, 2014
Restricted Stock Units
Mar. 31, 2014
Performance Share Awards
Minimum
Mar. 31, 2014
Performance Share Awards
Maximum
Mar. 31, 2014
Performance Share Awards Based on Internal Performance Metrics
Maximum
Mar. 31, 2014
Employee Performance Share Awards
Mar. 31, 2014
Hybrid Performance Share Awards
Mar. 31, 2014
Performance Shares Based on Market Conditions
Maximum
Feb. 20, 2014
TSR Performance Share Awards
Mar. 31, 2014
TSR Performance Share Awards
item
Stock-based Compensation arrangements                            
Stock based compensation expense $ 3.2 $ 18.7 $ 1.5 $ 3.4                    
Tax benefits realized for stock-based compensation 16.0 2.1                        
Granted (in shares)         44,000 32,203       241,130 123,257     184,885
Granted (in dollars per share)         $ 35.00 $ 39.33       $ 39.43 $ 39.43      
Number of years over which performance criteria is to be met                   3 years       3 years
Annual forfeiture rate assumption (as a percent)         5.00%   0.00% 5.00%            
Right to receive shares (as a percent)                 100.00%     100.00%    
Vesting rights                     The 2014 awards vest 25% on each of the first and second anniversary dates and 50% on the third anniversary      
Minimum operating cash flow for the year preceding the performance period                     $ 100      
Right to receive additional shares (as a percent)                       100.00%    
Number of other companies in the Company's peer group                           14
Assumptions                            
Fair value per performance share award (in dollars per share)                         $ 32.04  
Fair value per performance share award Assumptions, low end of range (in dollars per share)                           $ 9.58
Fair value per performance share award Assumptions, high end of range (in dollars per share)                           $ 25.37
Stock price volatility (as a percent)     37.50%                   41.30%  
Stock Price Volatility, low end of range (as a percent)                           30.70%
Stock Price Volatility, high end of range (as a percent)                           78.70%
Risk free rate of return (as a percent)     1.10%                   0.70%  
Risk free rate of return, low end of range (as a percent)                           0.10%
Risk free rate of return, high end of range (as a percent)                           0.80%
Expected dividend yield (as a percent)                         0.20% 0.20%
Annual salary increase rate (as a percent)     4.00%                      
Annual turnover rate     4.60%