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Fair value measurements - Financial instruments disclosed, but not carried at fair value (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Financial instruments not carried at fair value    
Debt $ 685.2 $ 696.8
2017 SEK Subordinated Notes    
Financial instruments not carried at fair value    
Debt 291.2 303.6
2016 SIG Senior Notes    
Financial instruments not carried at fair value    
Debt 394.0 393.2
Fair Value | Level 3 | Series B preference shares    
Financial instruments not carried at fair value    
Redeemable preference shares 186.4 191.7
Fair Value | Level 3 | 2017 SEK Subordinated Notes    
Financial instruments not carried at fair value    
Debt 294.5 309.5
Fair Value | Level 3 | 2016 SIG Senior Notes    
Financial instruments not carried at fair value    
Debt 394.5 347.6
Carrying Value | Series B preference shares    
Financial instruments not carried at fair value    
Redeemable preference shares 223.0 232.2
Carrying Value | 2017 SEK Subordinated Notes    
Financial instruments not carried at fair value    
Debt 291.2 303.6
Carrying Value | 2016 SIG Senior Notes    
Financial instruments not carried at fair value    
Debt $ 394.0 $ 393.2