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Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Inputs, Level 2 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Foreign currency forward contracts receivable $ 15.9   $ 8.7  
Loans Receivable, Gross, Mortgage Warehouse Lending, Fair Value Disclosure 250.8      
Deferred compensation plan assets 198.5   173.0  
Derivative Asset 0.0   0.0  
Total assets at fair value 465.2   181.7  
Foreign currency forward contracts payable 0.3   22.9  
Deferred compensation plan liabilities 192.9   169.5  
Business Combination, Contingent Consideration, Liability 0.0   0.0  
Derivative Liability 0.0   0.0  
Total liabilities at fair value 193.2   192.4  
Fair Value, Inputs, Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Foreign currency forward contracts receivable 0.0   0.0  
Loans Receivable, Gross, Mortgage Warehouse Lending, Fair Value Disclosure 0.0      
Deferred compensation plan assets 0.0   0.0  
Derivative Asset 27.4   31.4  
Total assets at fair value 27.4   31.4  
Foreign currency forward contracts payable 0.0   0.0  
Deferred compensation plan liabilities 0.0   0.0  
Business Combination, Contingent Consideration, Liability 232.8 $ 158.8 229.6 $ 127.3
Derivative Liability 20.2   15.9  
Total liabilities at fair value 253.0   245.5  
Derivative Assets (Liabilities), at Fair Value, Net 7.2   $ 15.5  
Earn-out Liabilities [Member] | Fair Value, Inputs, Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value, decrease due to change in assumptions (2.6) 0.2    
Fair Value, foreign currency translation adjustments 1.2 0.7    
Fair Value, purchases 9.6 32.3    
Fair Value, settlements (5.0) $ (1.7)    
Derivative [Member] | Fair Value, Inputs, Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value, decrease due to change in assumptions 0.1      
Fair Value, foreign currency translation adjustments 0.0      
Fair Value, purchases 11.9      
Fair Value, settlements $ (20.3)