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Significant transactions - Loss Portfolio Transfer (Details) - USD ($)
$ in Millions
9 Months Ended
Jul. 07, 2020
Jan. 23, 2020
Sep. 30, 2020
Sep. 30, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gain (loss) on disposition of business     $ 0.9 $ 0.0
Cash received in loss portfolio transfer agreement   $ 69.7    
Cash paid in loss portfolio transfer agreement   $ 0.4    
Empire Insurance Company | Runoff & Other        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Percentage of stock disposed of 100.00%      
Proceeds from fees received $ 11.4      
Gain (loss) on disposition of business $ 0.9