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Related Party Transactions (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 09, 2018
Dec. 31, 2018
Dec. 31, 2017
Key management team      
Disclosure of transactions between related parties [line items]      
Salaries and other short-term employee benefits   $ 9.3 $ 9.7
Share-based payments   3.6 3.1
Related party compensation   12.9 12.8
Board of Directors      
Disclosure of transactions between related parties [line items]      
Retainers and fees   0.9 0.8
Share-based payments   0.3 0.3
Related party compensation   $ 1.2 1.1
Lissom      
Disclosure of transactions between related parties [line items]      
Amount of operating companies managed     $ 50.0
Fairfax India      
Disclosure of transactions between related parties [line items]      
Performance fee revenue $ 114.4