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Acquisitions (Narrative) (Details) - USD ($)
$ in Millions
Jul. 26, 2017
Jul. 19, 2017
Apr. 28, 2017
SureTec Financial Corp [Member]      
Business Acquisition [Line Items]      
Total consideration     $ 246.9
Cash consideration     225.6
Goodwill recognized     70.4
Goodwill, tax deductible     0.0
Finite-lived and indefinite-lived intangible assets     103.0
SureTec Financial Corp [Member] | Agent Relationships [Member]      
Business Acquisition [Line Items]      
Finite-lived intangible assets     $ 92.0
Definite-lived intangible assets, weighted-average amortization period     15 years
Costa Farms [Member] | Subsequent Event [Member]      
Business Acquisition [Line Items]      
Percentage acquired   81.00%  
Fixed portion of cash consideration   $ 255.0  
State National Companies, Inc. [Member] | Subsequent Event [Member]      
Business Acquisition [Line Items]      
Total consideration $ 919.0