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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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums $ 305.7 $ 277.6 $ 1,095.4 $ 874.7
Client location: United States        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 179.0 166.2 601.5 455.6
Client location: Europe        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 46.1 43.7 249.6 209.0
Client location: Canada, the Caribbean, Bermuda and Latin America        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 30.1 32.6 85.7 80.2
Client location: Asia and Other        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 50.5 35.1 158.6 129.9
Underwriting location: United States        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 46.1 40.1 130.6 119.4
Underwriting location: Europe        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 150.1 113.1 568.8 450.1
Underwriting location: Canada, the Caribbean, Bermuda and Latin America        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 91.6 112.8 348.4 270.7
Underwriting location: Asia and Other        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 17.9 11.6 47.6 34.5
Global Property | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 144.9 121.4 569.1 450.8
Global Property | Client location: United States | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 62.4 46.2 241.0 186.5
Global Property | Client location: Europe | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 22.8 22.2 148.4 116.3
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 24.7 28.9 69.7 65.6
Global Property | Client location: Asia and Other | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 35.0 24.1 110.0 82.4
Global Property | Underwriting location: United States | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 12.6 3.0 28.8 40.6
Global Property | Underwriting location: Europe | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 61.3 43.2 271.5 207.1
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 53.8 64.2 224.0 171.2
Global Property | Underwriting location: Asia and Other | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 17.2 11.0 44.8 31.9
Global A&H | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 87.9 107.6 286.2 260.1
Global A&H | Client location: United States | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 71.4 95.1 229.5 220.4
Global A&H | Client location: Europe | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 7.4 6.1 25.1 17.4
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 2.6 2.1 8.6 6.7
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 6.5 4.3 23.0 15.6
Global A&H | Underwriting location: United States | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 27.7 37.1 81.0 80.3
Global A&H | Underwriting location: Europe | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 52.7 36.7 164.5 107.7
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 7.3 33.8 40.1 71.8
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   0.6 0.3
Specialty & Casualty | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 72.6 48.4 228.3 164.5
Specialty & Casualty | Client location: United States | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 45.3 25.2 119.6 49.9
Specialty & Casualty | Client location: Europe | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 15.8 15.4 76.0 75.3
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 2.8 1.5 7.4 7.8
Specialty & Casualty | Client location: Asia and Other | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 8.7 6.3 25.3 31.5
Specialty & Casualty | Underwriting location: United States | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 5.8 0.3 9.3 (0.3)
Specialty & Casualty | Underwriting location: Europe | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 36.1 33.1 132.8 135.2
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 30.5 14.8 84.3 27.7
Specialty & Casualty | Underwriting location: Asia and Other | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 0.2 0.2 1.9 1.9
Runoff & Other | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 0.3 0.2 11.8 (0.7)
Runoff & Other | Client location: United States | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums (0.1) (0.3) 11.4 (1.2)
Runoff & Other | Client location: Europe | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 0.1   0.1  
Runoff & Other | 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   0.1   0.1
Runoff & Other | Client location: Asia and Other | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 0.3 0.4 0.3 0.4
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) 11.5 (1.2)
Runoff & Other | Underwriting location: Europe | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums   0.1   0.1
Runoff & Other | Underwriting location: Asia and Other | Reportable segments        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums $ 0.3 $ 0.4 $ 0.3 $ 0.4