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Fair value measurements - Fair Value Measurements by Level (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Assets measured at fair value    
Fixed maturity investments, at fair value $ 1,815.7 $ 1,949.2
Equity securities 387.8 380.0
Short-term investments 882.9 715.5
Other long-term investments 88.0 63.6
Total investments 3,174.4 3,108.3
Derivative instruments 2.9 4.1
Total assets measured at fair value 3,177.3 3,112.4
Liabilities measured at fair value    
Contingent consideration liabilities 30.8 28.8
Derivative instruments 6.0 5.1
Total liabilities measured at fair value 36.8 33.9
U.S. government and government agency    
Assets measured at fair value    
Fixed maturity investments, at fair value 157.4 167.9
Corporate debt securities    
Assets measured at fair value    
Fixed maturity investments, at fair value 606.6 695.8
Residential mortgage-backed securities    
Assets measured at fair value    
Fixed maturity investments, at fair value 398.0 494.5
Asset-backed securities    
Assets measured at fair value    
Fixed maturity investments, at fair value 513.6 413.5
Commercial mortgage-backed securities    
Assets measured at fair value    
Fixed maturity investments, at fair value 107.8 115.9
Non-U.S. government and government agency    
Assets measured at fair value    
Fixed maturity investments, at fair value 28.5 50.3
Preferred stocks    
Assets measured at fair value    
Fixed maturity investments, at fair value 1.2 8.5
U.S. States, municipalities, and political subdivision    
Assets measured at fair value    
Fixed maturity investments, at fair value 2.6 2.8
Investment grade fixed income mutual funds    
Assets measured at fair value    
Equity securities 151.9 157.7
Common shares    
Assets measured at fair value    
Equity securities 233.4 222.3
Other    
Assets measured at fair value    
Equity securities 2.5  
Hedge funds and private equity funds    
Liabilities measured at fair value    
Fair value of hedges 291.9 301.4
Level 1    
Assets measured at fair value    
Fixed maturity investments, at fair value 184.5 207.6
Equity securities 385.3 380.0
Short-term investments 845.6 679.3
Total investments 1,415.4 1,266.9
Derivative instruments 0.8  
Total assets measured at fair value 1,416.2 1,266.9
Liabilities measured at fair value    
Derivative instruments 0.3 0.5
Total liabilities measured at fair value 0.3 0.5
Level 1 | U.S. government and government agency    
Assets measured at fair value    
Fixed maturity investments, at fair value 156.0 164.7
Level 1 | Non-U.S. government and government agency    
Assets measured at fair value    
Fixed maturity investments, at fair value 28.5 42.9
Level 1 | Investment grade fixed income mutual funds    
Assets measured at fair value    
Equity securities 151.9 157.7
Level 1 | Common shares    
Assets measured at fair value    
Equity securities 233.4 222.3
Level 2    
Assets measured at fair value    
Fixed maturity investments, at fair value 1,631.2 1,736.2
Equity securities 2.5  
Short-term investments 37.3 36.2
Total investments 1,671.0 1,772.4
Total assets measured at fair value 1,671.0 1,772.4
Level 2 | U.S. government and government agency    
Assets measured at fair value    
Fixed maturity investments, at fair value 1.4 3.2
Level 2 | Corporate debt securities    
Assets measured at fair value    
Fixed maturity investments, at fair value 606.6 695.8
Level 2 | Residential mortgage-backed securities    
Assets measured at fair value    
Fixed maturity investments, at fair value 398.0 494.5
Level 2 | Asset-backed securities    
Assets measured at fair value    
Fixed maturity investments, at fair value 513.6 413.5
Level 2 | Commercial mortgage-backed securities    
Assets measured at fair value    
Fixed maturity investments, at fair value 107.8 115.9
Level 2 | Non-U.S. government and government agency    
Assets measured at fair value    
Fixed maturity investments, at fair value   7.4
Level 2 | Preferred stocks    
Assets measured at fair value    
Fixed maturity investments, at fair value 1.2 3.1
Level 2 | U.S. States, municipalities, and political subdivision    
Assets measured at fair value    
Fixed maturity investments, at fair value 2.6 2.8
Level 2 | Other    
Assets measured at fair value    
Equity securities 2.5  
Level 3    
Assets measured at fair value    
Fixed maturity investments, at fair value   5.4
Other long-term investments 88.0 63.6
Total investments 88.0 69.0
Derivative instruments 2.1 4.1
Total assets measured at fair value 90.1 73.1
Liabilities measured at fair value    
Contingent consideration liabilities 30.8 28.8
Derivative instruments 5.7 4.6
Total liabilities measured at fair value $ 36.5 33.4
Level 3 | Preferred stocks    
Assets measured at fair value    
Fixed maturity investments, at fair value   $ 5.4