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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums $ 282.3 $ 322.3 $ 1,218.2 $ 1,208.8
Client location: United States        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 165.3 215.4 714.5 726.3
Client location: Europe        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 56.3 35.4 284.6 226.7
Client location: Canada, the Caribbean, Bermuda and Latin America        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 24.6 28.3 80.7 81.0
Client location: Asia and Other        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 36.1 43.2 138.4 174.8
Underwriting location: United States        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 103.7 57.8 476.1 194.8
Underwriting location: Europe        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 128.3 164.3 526.1 600.3
Underwriting location: Canada, the Caribbean, Bermuda and Latin America        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 39.4 90.7 170.7 367.8
Underwriting location: Asia and Other        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 10.9 9.5 45.3 45.9
Global Reinsurance        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 192.2 202.6 758.1 805.2
Global Reinsurance | Client location: United States        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 86.7 112.8 297.9 382.1
Global Reinsurance | Client location: Europe        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 49.3 29.7 264.8 207.7
Global Reinsurance | Client location: Canada, the Caribbean, Bermuda and Latin America        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 25.9 24.5 74.2 70.2
Global Reinsurance | Client location: Asia and Other        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 30.3 35.6 121.2 145.2
Global Reinsurance | Underwriting location: United States        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 53.8 20.2 162.5 57.8
Global Reinsurance | Underwriting location: Europe        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 84.9 81.9 376.3 368.0
Global Reinsurance | Underwriting location: Canada, the Caribbean, Bermuda and Latin America        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 42.8 91.3 174.6 334.4
Global Reinsurance | Underwriting location: Asia and Other        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 10.7 9.2 44.7 45.0
Global A&H        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 72.2 104.6 334.9 360.1
Global A&H | Client location: United States        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 57.3 87.6 288.7 301.2
Global A&H | Client location: Europe        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 7.0 5.8 19.4 18.9
Global A&H | Client location: Canada, the Caribbean, Bermuda and Latin America        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 2.3 3.7 10.1 10.7
Global A&H | Client location: Asia and Other        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 5.6 7.5 16.7 29.3
Global A&H | Underwriting location: United States        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 28.6 36.9 185.7 136.0
Global A&H | Underwriting location: Europe        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 43.4 68.1 149.4 190.1
Global A&H | Underwriting location: Canada, the Caribbean, Bermuda and Latin America        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 0.2 (0.6) (0.3) 33.4
Global A&H | Underwriting location: Asia and Other        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 0.0 0.2 0.1 0.6
U.S. Specialty        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 20.5 14.3 59.5 42.0
U.S. Specialty | Client location: United States        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 20.5 14.3 59.5 42.0
U.S. Specialty | Client location: Europe        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 0.0 0.0 0.0 0.0
U.S. Specialty | Client location: Canada, the Caribbean, Bermuda and Latin America        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 0.0 0.0 0.0 0.0
U.S. Specialty | Client location: Asia and Other        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 0.0 0.0 0.0 0.0
U.S. Specialty | Underwriting location: United States        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 20.5 0.0 59.5 0.0
U.S. Specialty | Underwriting location: Europe        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 0.0 14.3 0.0 42.0
U.S. Specialty | Underwriting location: Canada, the Caribbean, Bermuda and Latin America        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 0.0 0.0 0.0 0.0
U.S. Specialty | Underwriting location: Asia and Other        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 0.0 0.0 0.0 0.0
Runoff & Other        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums (2.6) 0.8 65.7 1.5
Runoff & Other | Client location: United States        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 0.8 0.7 68.4 1.0
Runoff & Other | Client location: Europe        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 0.0 (0.1) 0.4 0.1
Runoff & Other | Client location: Canada, the Caribbean, Bermuda and Latin America        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums (3.6) 0.1 (3.6) 0.1
Runoff & Other | Client location: Asia and Other        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 0.2 0.1 0.5 0.3
Runoff & Other | Underwriting location: United States        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 0.8 0.7 68.4 1.0
Runoff & Other | Underwriting location: Europe        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums 0.0 0.0 0.4 0.2
Runoff & Other | Underwriting location: Canada, the Caribbean, Bermuda and Latin America        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums (3.6) 0.0 (3.6) 0.0
Runoff & Other | Underwriting location: Asia and Other        
Net premiums written by client location and underwriting location by reportable segment        
Net written premiums $ 0.2 $ 0.1 $ 0.5 $ 0.3