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Acquisitions (Narrative) (Details) - USD ($)
$ in Millions
Jun. 20, 2019
Nov. 14, 2018
Oct. 01, 2018
Hagerty Group, LLC [Member]      
Business Acquisition [Line Items]      
Total purchase consideration $ 212.5    
Brahmin [Member]      
Business Acquisition [Line Items]      
Percentage acquired     90.00%
Total purchase consideration     $ 192.9
Cash consideration     172.3
Goodwill recognized     63.8
Intangible Assets     93.3
Noncontrolling Interest     19.6
Brahmin [Member] | Customer Relationships [Member]      
Business Acquisition [Line Items]      
Finite-lived intangible assets     $ 57.0
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   $ 974.4  
Cash consideration   974.4  
Goodwill recognized   434.2  
Intangible Assets   551.0  
Goodwill, tax deductible   0.0  
Noncontrolling Interest   15.1  
Nephila Holdings Limited [Member] | Investment Management Agreements [Member]      
Business Acquisition [Line Items]      
Finite-lived intangible assets   $ 468.0  
Definite-lived intangible assets, weighted-average amortization period   17 years  
Nephila Holdings Limited [Member] | Broker Relationships [Member]      
Business Acquisition [Line Items]      
Finite-lived intangible assets   $ 32.0  
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   $ 24.0  
Definite-lived intangible assets, weighted-average amortization period   14 years