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Segment information - Net premiums written by client location and underwriting location by reportable segment (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums $ 401.7 $ 320.3 $ 886.5 $ 789.7
Client location: United States        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 269.5 204.6 510.9 422.5
Client location: Europe        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 33.5 35.3 191.3 203.5
Client location: Canada, the Caribbean, Bermuda and Latin America        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 18.8 25.0 52.7 55.6
Client location: Asia and Other        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 79.9 55.4 131.6 108.1
Underwriting location: United States        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 76.1 52.2 137.0 84.5
Underwriting location: Europe        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 163.0 141.6 436.0 418.7
Underwriting location: Canada, the Caribbean, Bermuda and Latin America        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 144.0 113.8 277.1 256.8
Underwriting location: Asia and Other        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 18.6 12.7 36.4 29.7
Global Property | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 191.6 177.0 432.9 424.2
Global Property | Client location: United States | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 103.2 91.6 165.2 178.6
Global Property | Client location: Europe | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 15.1 19.3 139.7 125.6
Global Property | Client location: Canada, the Caribbean, Bermuda and Latin America | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 14.6 21.8 39.1 45.0
Global Property | Client location: Asia and Other | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 58.7 44.3 88.9 75.0
Global Property | Underwriting location: United States | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 4.4 10.9 12.5 16.2
Global Property | Underwriting location: Europe | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 70.1 73.7 224.7 210.2
Global Property | Underwriting location: Canada, the Caribbean, Bermuda and Latin America | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 99.0 80.4 161.3 170.2
Global Property | Underwriting location: Asia and Other | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 18.1 12.0 34.4 27.6
Global A&H | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 120.6 82.8 255.5 198.3
Global A&H | Client location: United States | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 102.5 70.6 213.6 158.1
Global A&H | Client location: Europe | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 5.0 6.1 13.1 17.7
Global A&H | Client location: Canada, the Caribbean, Bermuda and Latin America | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 2.0 1.2 7.0 6.0
Global A&H | Client location: Asia and Other | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 11.1 4.9 21.8 16.5
Global A&H | Underwriting location: United States | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 58.7 32.3 99.1 53.3
Global A&H | Underwriting location: Europe | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 58.4 43.2 122.0 111.8
Global A&H | Underwriting location: Canada, the Caribbean, Bermuda and Latin America | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 3.3 7.1 34.0 32.8
Global A&H | Underwriting location: Asia and Other | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 0.2 0.2 0.4 0.4
Specialty & Casualty | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 89.2 55.1 197.4 155.7
Specialty & Casualty | Client location: United States | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 63.5 37.0 131.8 74.3
Specialty & Casualty | Client location: Europe | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 13.4 9.9 38.3 60.2
Specialty & Casualty | Client location: Canada, the Caribbean, Bermuda and Latin America | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 2.2 2.0 6.6 4.6
Specialty & Casualty | Client location: Asia and Other | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 10.1 6.2 20.7 16.6
Specialty & Casualty | Underwriting location: United States | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 12.7 3.6 25.1 3.5
Specialty & Casualty | Underwriting location: Europe | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 34.5 24.7 89.1 96.7
Specialty & Casualty | Underwriting location: Canada, the Caribbean, Bermuda and Latin America | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 41.7 26.3 81.8 53.8
Specialty & Casualty | Underwriting location: Asia and Other | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 0.3 0.5 1.4 1.7
Runoff & Other | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 0.3 5.4 0.7 11.5
Runoff & Other | Client location: United States | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 0.3 5.4 0.3 11.5
Runoff & Other | Client location: Europe | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums     0.2  
Runoff & Other | Client location: Asia and Other | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums     0.2  
Runoff & Other | Underwriting location: United States | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums $ 0.3 $ 5.4 0.3 $ 11.5
Runoff & Other | Underwriting location: Europe | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums     0.2  
Runoff & Other | Underwriting location: Asia and Other | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums     $ 0.2