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Significant transactions - Easterly Acquisition Corp., WRM America Indemnity Company, Inc. and The Phoenix Holdings Ltd. (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Nov. 05, 2018
USD ($)
$ / shares
employee1
shares
Aug. 22, 2018
shares
Aug. 16, 2018
USD ($)
Jul. 02, 2018
USD ($)
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Nov. 16, 2018
USD ($)
Nov. 02, 2018
USD ($)
Sep. 30, 2018
$ / shares
Significant transactions                    
Value of shares redeemed $ 164.0                  
Shares issued (in shares) | shares         148,090 4,670,531 0      
Total share-based compensation expense - pre-tax         $ 4.7 $ 2.5 $ 0.0      
Stock redeemed (in shares) | shares 9,519,280       0 9,519,280 0      
ESPP                    
Significant transactions                    
Minimum number of shares to be purchased (in shares) | shares   100                
Maximum number of shares to be purchased (in shares) | shares   1,000                
Preference Share Investors | Private Placement | Series B preference shares                    
Significant transactions                    
Share subscriptions (in shares) | shares 11,901,670                  
The Phoenix                    
Significant transactions                    
Charge on termination of share repurchase agreement       $ 4.5            
Merger Agreement                    
Significant transactions                    
Gross proceeds $ 226.1                  
Proceeds from merger, private placement and employee stock purchase plan $ 268.0                  
Merger Agreement | Private Placement                    
Significant transactions                    
Number of times of diluted book value per share, exchange price of share 1.05                  
Adjusted diluted book value per share (in dollars per share) | $ / shares 17.22447                  
Merger Agreement | ESPP                    
Significant transactions                    
Number of times of diluted book value per share, exchange price of share 1.05                  
Minimum number of shares to be purchased (in shares) | shares 100                  
Maximum number of shares to be purchased (in shares) | shares 1,000                  
Loan repayment term 2 years                  
Number of employees that purchased shares | employee1 405                  
Number of common shares purchased (in shares) | shares 149,236                  
Total share-based compensation expense - pre-tax $ 2.6                  
Merger Agreement | CM Bermuda                    
Significant transactions                    
Adjustment to consideration payable               $ 1.6    
Merger related contractual costs 9.0                  
Merger related legal, advisory and other costs $ 7.1                  
Merger Agreement | CM Bermuda | Common shares                    
Significant transactions                    
Reported book value per share (in dollars per share) | $ / shares                   $ 16.44
Subscription Agreement | Preference Share Investors | Private Placement                    
Significant transactions                    
Warrants received (in shares) | shares 5,418,434                  
Exercisable period of warrants 5 years                  
Strike price as a percentage of the per share purchase price 125.00%                  
Warrant strike price per share (in dollars per share) | $ / shares $ 21.53                  
Cost value of warrants $ 9.6                  
Stock issuance costs $ 2.0                  
Subscription Agreement | Preference Share Investors | Private Placement | Series B preference shares                    
Significant transactions                    
Share subscriptions (in shares) | shares 11,901,670                  
Value of share subscriptions $ 195.8                  
Subscription Agreement | Preference Share Investors | Private Placement | Series B preference shares | Common shares                    
Significant transactions                    
Share subscriptions (in shares) | shares 1,225,954                  
Value of share subscriptions $ 20.8                  
Redemption Agreement | CM Bermuda | Common shares                    
Significant transactions                    
Value of shares redeemed $ 164.0                  
Stock redeemed (in shares) | shares 9,519,280                  
Share price (in dollars per share) | $ / shares $ 17.22447                  
Redemption Agreement | IMGAH                    
Significant transactions                    
Redemption amount of preference shares $ 95.0                  
Easterly | Merger Agreement                    
Significant transactions                    
Public shares held by Easterly's public stockholders in trust $ 39.3               $ 149.0  
Shares issued (in shares) | shares 2,280,241                  
Issuance of converted warrants (in shares) | shares 6,088,535                  
Easterly | Merger Agreement | Common shares                    
Significant transactions                    
Number of times of diluted book value per share, exchange price of share 1.05                  
Exchange ratio 0.609                  
Value of shares redeemed $ 109.7                  
WRM America Indemnity Company, Inc.                    
Significant transactions                    
Percentage of ownership interest acquired     100.00%              
Consideration     $ 16.9              
Acquisition of intangible assets     $ 3.1              
For the first 100 shares | ESPP                    
Significant transactions                    
Purchase price of common shares as a percentage on its market value   85.00%                
For the first 100 shares | Merger Agreement | ESPP                    
Significant transactions                    
Purchase price of common shares as a percentage on its market value 85.00%                  
For the next 900 shares | ESPP                    
Significant transactions                    
Purchase price of common shares as a percentage on its market value   100.00%                
For the next 900 shares | Merger Agreement | ESPP                    
Significant transactions                    
Purchase price of common shares as a percentage on its market value 100.00%