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Acquisitions (Narrative) (Details) - USD ($)
$ in Millions
Nov. 14, 2018
Oct. 01, 2018
Brahmin [Member]    
Business Acquisition [Line Items]    
Percentage acquired   90.00%
Total purchase consideration   $ 193.8
Cash consideration   173.3
Goodwill recognized   63.9
Intangible Assets   90.3
Noncontrolling Interest   19.6
Brahmin [Member] | Customer Relationships [Member]    
Business Acquisition [Line Items]    
Finite-lived intangible assets   $ 54.0
Definite-lived intangible assets, weighted-average amortization period   16 years
Brahmin [Member] | Trade Names [Member]    
Business Acquisition [Line Items]    
Finite-lived intangible assets   $ 35.0
Definite-lived intangible assets, weighted-average amortization period   16 years
Brahmin [Member] | Other Intangible Assets [Member]    
Business Acquisition [Line Items]    
Finite-lived intangible assets   $ 1.3
Definite-lived intangible assets, weighted-average amortization period   8 years
Nephila Holdings Limited [Member]    
Business Acquisition [Line Items]    
Percentage acquired 100.00%  
Total purchase consideration $ 970.9  
Cash consideration 970.9  
Goodwill recognized 460.0  
Intangible Assets 533.5  
Goodwill, tax deductible 0.0  
Noncontrolling Interest 25.5  
Nephila Holdings Limited [Member] | Investment Management Agreements [Member]    
Business Acquisition [Line Items]    
Finite-lived intangible assets $ 452.0  
Definite-lived intangible assets, weighted-average amortization period 16 years  
Nephila Holdings Limited [Member] | Broker Relationships [Member]    
Business Acquisition [Line Items]    
Finite-lived intangible assets $ 31.0  
Definite-lived intangible assets, weighted-average amortization period 12 years  
Nephila Holdings Limited [Member] | Technology-Based Intangible Assets [Member]    
Business Acquisition [Line Items]    
Finite-lived intangible assets $ 27.0  
Definite-lived intangible assets, weighted-average amortization period 6 years  
Nephila Holdings Limited [Member] | Trade Names [Member]    
Business Acquisition [Line Items]    
Finite-lived intangible assets $ 23.5  
Definite-lived intangible assets, weighted-average amortization period 14 years