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Stockbased Compensation Expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Stock Option Awards $ 43.7 $ 45.7 $ 41.4
Restricted Unit Awards 81.3 71.4 49.5
Stock-based Compensation Expense 125.0 117.1 $ 90.9
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation Expense, Cash-in-Lieu of Pre-acquisition Equity Awards 22.0 $ 35.0  
Employee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized Compensation Costs On Nonvested Awards $ 72.0    
Unrecognized Compensation Costs On Nonvested Awards, Weighted Average Period Of Recognition 2 years 5 months    
Employee Stock Option [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized Compensation Costs on Nonvested Awards, Period of Recognition 4 years    
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized Compensation Costs On Nonvested Awards $ 118.0    
Unrecognized Compensation Costs On Nonvested Awards, Weighted Average Period Of Recognition 2 years    
Restricted Stock Units (RSUs) [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized Compensation Costs on Nonvested Awards, Period of Recognition 4 years