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Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Inputs, Level 1 [Member]      
Assets      
Investments, Fair Value Disclosure, Measured at Fair Value $ 47.3 $ 43.7  
Foreign currency forward contracts receivable 0.0 0.0  
Warehouse receivables 0.0    
Deferred compensation plan assets 0.0 0.0  
Mortgage Banking Derivative Assets 0.0 0.0  
Total assets at fair value 47.3 43.7  
Liabilities      
Foreign currency forward contracts payable 0.0 0.0  
Deferred compensation plan liabilities 0.0 0.0  
Business Combination, Contingent Consideration, Liability 0.0 0.0  
Mortgage Banking Derivative Liabilities 0.0 0.0  
Total liabilities at fair value 0.0 0.0  
Fair Value, Inputs, Level 2 [Member]      
Assets      
Investments, Fair Value Disclosure, Measured at Fair Value 0.0 0.0  
Foreign currency forward contracts receivable 13.2 8.7  
Warehouse receivables 317.5    
Deferred compensation plan assets 229.7 173.0  
Mortgage Banking Derivative Assets 0.0 0.0  
Total assets at fair value 560.4 181.7  
Liabilities      
Foreign currency forward contracts payable 1.9 22.9  
Deferred compensation plan liabilities 228.4 169.5  
Business Combination, Contingent Consideration, Liability 0.0 0.0  
Mortgage Banking Derivative Liabilities 0.0 0.0  
Total liabilities at fair value 230.3 192.4  
Fair Value, Inputs, Level 3 [Member]      
Assets      
Investments, Fair Value Disclosure, Measured at Fair Value 0.0 0.0  
Foreign currency forward contracts receivable 0.0 0.0  
Warehouse receivables 0.0    
Deferred compensation plan assets 0.0 0.0  
Mortgage Banking Derivative Assets 19.0 31.4  
Total assets at fair value 19.0 31.4  
Liabilities      
Foreign currency forward contracts payable 0.0 0.0  
Deferred compensation plan liabilities 0.0  
Business Combination, Contingent Consideration, Liability 227.1 229.6 $ 127.3
Mortgage Banking Derivative Liabilities 10.3 15.9  
Total liabilities at fair value $ 237.4 $ 245.5