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Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Fair Value, Inputs, Level 1 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investments in real estate ventures - fair value $ 49.3 $ 47.3    
Foreign currency forward contracts receivable 0.0 0.0    
Warehouse receivables 0.0 0.0    
Deferred compensation plan assets 0.0 0.0    
Mortgage banking derivative asset 0.0 0.0    
Total assets at fair value 49.3 47.3    
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]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investments in real estate ventures - fair value 0.0 0.0    
Foreign currency forward contracts receivable 1.8 13.2    
Warehouse receivables 419.6 317.5    
Deferred compensation plan assets 251.1 229.7    
Mortgage banking derivative asset 0.0 0.0    
Total assets at fair value 672.5 560.4    
Foreign currency forward contracts payable 9.0 1.9    
Deferred compensation plan liabilities 248.6 228.4    
Business Combination, Contingent Consideration, Liability 0.0 0.0    
Mortgage banking derivative liabilities 0.0 0.0    
Total liabilities at fair value 257.6 230.3    
Fair Value, Inputs, Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Assets (Liabilities), at Fair Value, Net 5.8 8.7 $ 7.2 $ 15.5
Investments in real estate ventures - fair value 0.0 0.0    
Foreign currency forward contracts receivable 0.0 0.0    
Warehouse receivables 0.0 0.0    
Deferred compensation plan assets 0.0 0.0    
Mortgage banking derivative asset 29.6 19.0    
Total assets at fair value 29.6 19.0    
Foreign currency forward contracts payable 0.0 0.0    
Deferred compensation plan liabilities 0.0    
Business Combination, Contingent Consideration, Liability 220.3 227.1 $ 232.8 $ 229.6
Mortgage banking derivative liabilities 23.8 10.3    
Total liabilities at fair value $ 244.1 $ 237.4