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Acquisition of Tokio Millennium RE (Details) - Tokio Millennium Re
$ / shares in Units, $ in Millions
Oct. 30, 2018
USD ($)
$ / shares
Business Acquisition [Line Items]  
Stock Purchase Agreement, multiple applied to determine aggregate consideration 1.02
Stock Purchase Agreement, volume-weighted average closing price, term 30 days
Stock Purchase Agreement, minimum volume-weighted average closing price (in dollars per share) | $ / shares $ 128.37
Stock Purchase Agreement, amount used to determine additional consideration $ 250.0
Minimum  
Business Acquisition [Line Items]  
Stock Purchase Agreement, expected dividend payments 275.0
Maximum  
Business Acquisition [Line Items]  
Stock Purchase Agreement, expected dividend payments $ 500.0