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Share-Based Incentive Plan (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 10, 2015
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares under stock awards converted   4,100,000  
Share-based compensation expense   $ 21.8  
Stock appreciation rights      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares under stock awards converted 4,100,000    
Restricted stock | Vest ratably over four years      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option award vesting period, in years   4 years  
Number of restricted stock awards, granted   4,414  
Restricted stock | Vest ratably over three years      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option award vesting period, in years   3 years  
Number of restricted stock awards, granted   769,963  
Restricted stock | Vest ratably over two and a third years      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option award vesting period, in years   2 years 3 months 18 days  
Number of restricted stock awards, granted   79,306  
Restricted stock | Vest after three years      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option award vesting period, in years   3 years  
Number of restricted stock awards, granted   3,522  
Restricted stock | Vest after six months      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option award vesting period, in years   6 months  
Number of restricted stock awards, granted   32,580  
Restricted Stock Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares under stock awards converted 1,107,207 1,107,207  
Number of restricted stock awards, granted   1,292,783  
Performance Shares | Vest after three years      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted stock awards, granted   165,086  
Market condition | Vest after two and a third years      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option award vesting period, in years   2 years 3 months 18 days  
Number of restricted stock awards, granted   237,912  
Long Term Incentive Plan 2003      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock shares reserved for issuance to employees   55,300,000  
Total unrecognized compensation expense, net of estimated forfeitures   $ 129.1  
Weighted-average period over which total unrecognized compensation expense expected to be recognized (years)   2 years 2 months  
Intrinsic value of stock-based awards exercised and restricted stock units converted   $ 260.1 $ 162.2
Long Term Incentive Plan 2003 | Stock options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option award expiration period, in years   10 years  
Average remaining contractual term for options outstanding, in years   6 years 3 months 14 days  
Average remaining contractual term for options vested and expected to vest, in years   6 years 2 months 4 days  
Average remaining contractual term for options exercisable, in years   5 years 1 month 18 days  
Aggregate intrinsic value for options outstanding   $ 175.6  
Aggregate intrinsic value for options vested and expected to vest   172.8  
Aggregate intrinsic value for options exercisable   $ 157.3  
Long Term Incentive Plan 2003 | Minimum | Stock options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option award vesting period, in years   3 years  
Long Term Incentive Plan 2003 | Maximum | Stock options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option award vesting period, in years   4 years  
2014 Program | Stock appreciation rights and performance shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option award vesting period, in years   5 years  
2014 Program | Stock appreciation rights      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares granted under 2015 program   4,400,000  
2014 Program | Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Conversion of stock, shares issued 1,400,000    
Shares granted under 2015 program   1,500,000