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Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2015
Stock-Based Compensation        
Expense incurred for stock-based compensation plans $ 11.6   $ 10.1  
Expense incurred for stock-based compensation plans, net of tax $ 8.8   7.6  
2000 Employee Option Plan        
Stock-Based Compensation        
Number of additional stock options that can be granted (in shares) 0      
Options exercisable period 10 years      
2009 Employee Option Plan        
Stock-Based Compensation        
Common Stock reserved for issuance 58,000,000      
Shares available for the granting of additional stock options 18,714,960      
Options exercisable period 10 years      
Options ratable vesting period 5 years      
2004 Directors Option Plan        
Stock-Based Compensation        
Shares available for the granting of additional stock options 140,000      
Options exercisable period 10 years      
Number of additional stock options expected to be granted (in shares) 0      
Stock Options        
Stock option activity        
Options outstanding at the beginning of the period (in shares) 31,136,475      
Options granted (in shares) 245,000      
Options exercised (in shares) (650,840)      
Options forfeited (in shares) (48,680)      
Options outstanding at the end of the period (in shares) 30,681,955 31,136,475   31,136,475
Vested and non-vested options expected to vest at the end of the period (in shares) 28,686,910      
Exercisable at the end of the period (in shares) 13,206,995      
Weighted Average Exercise Price        
Weighted average exercise price, options outstanding at the beginning of the period (in dollars per share) $ 37.62      
Weighted average exercise price, options outstanding at the end of the period (in dollars per share) 37.97 $ 37.62   $ 37.62
Weighted average exercise price, vested and non-vested options expected to vest (in dollars per share) 37.34      
Weighted average exercise price, exercisable (in dollars per share) $ 27.03      
Weighted Average Remaining Contractual Term        
Weighted average remaining contractual term of options outstanding 6 years 9 months     6 years 11 months 1 day
Weighted average remaining contractual term of options vested options and non-vested expected to vest 6 years 7 months 28 days      
Weighted average remaining contractual term of options exercisable 5 years 1 month 24 days      
Aggregate Intrinsic Value        
Aggregate intrinsic value of options outstanding $ 609.9 $ 491.0   $ 491.0
Aggregate intrinsic value of options, vested and non-vested options expected to vest 588.3      
Aggregate intrinsic value of options exercisable $ 406.6      
Status of the Company's non-vested options and changes during the year        
Non-vested options at the beginning of the period (in shares) 17,323,040      
Non-vested options, options granted (in shares) 245,000      
Non-vested options, options vested (in shares) (44,400)      
Non-vested options, options forfeited (in shares) (48,680)      
Non-vested options at the end of the period (in shares) 17,474,960 17,323,040   17,323,040
Weighted Average Fair Value at Grant Date        
Weighted average fair value at the grant date, options outstanding at the beginning of the period (in dollars per share) $ 8.24      
Weighted average fair value at grant date, options granted (in dollars per share) 6.98      
Weighted average fair value at grant date, options vested (in dollars per share) 9.82      
Weighted average fair value at grant date, options forfeited (in dollars per share) 8.38      
Weighted average fair value at the grant date, options outstanding at the end of the period (in dollars per share) $ 8.22 $ 8.24   $ 8.24
Fair Value at Grant Date        
Total intrinsic value of stock options exercised $ 20.7   25.9  
Total fair value of stock options vested 0.4   $ 0.3  
Total compensation cost related to non-vested options not yet recognized $ 97.4      
Weighted average expected amortization period 3 years 2 months 12 days      
Restricted Shares        
Fair Value at Grant Date        
Total compensation cost related to non-vested restricted shares not yet recognized $ 0.1      
Weighted average expected amortization period 1 month 24 days      
Restricted Shares | 2012 Directors Restricted Stock Plan        
Stock-Based Compensation        
Shares available for the granting of additional stock options 153,974      
Restricted share activity        
Restricted shares outstanding at the beginning of the period (in shares) 17,256      
Restricted shares outstanding at the end of the period (in shares) 17,256 17,256   17,256
Fair Value at Grant Date        
Fair value at the grant date, restricted shares outstanding at the beginning of the period (in dollars per share) $ 57.97      
Fair value at the grant date, restricted shares outstanding at the end of the period (in dollars per share) $ 57.97 $ 57.97   $ 57.97
Weighted Average Remaining Amortization Term (in years) 1 month 24 days 4 months 21 days