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Fair value measurements - Fair Value Measurements by Level (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Assets measured at fair value    
Fixed maturity investments, at fair value $ 1,846.4 $ 1,949.2
Short-term investments 833.6 715.5
Equity securities 394.4 380.0
Other long-term investments 88.0 63.6
Total investments 3,162.4 3,108.3
Derivative instruments 0.8 4.1
Total assets measured at fair value 3,163.2 3,112.4
Liabilities measured at fair value    
Contingent consideration liabilities 28.8 28.8
Derivative instruments 5.3 5.1
Total liabilities measured at fair value 34.1 33.9
U.S. government and government agency    
Assets measured at fair value    
Fixed maturity investments, at fair value 158.4 167.9
Corporate debt securities    
Assets measured at fair value    
Fixed maturity investments, at fair value 628.1 695.8
Residential mortgage-backed securities    
Assets measured at fair value    
Fixed maturity investments, at fair value 425.8 494.5
Asset-backed securities    
Assets measured at fair value    
Fixed maturity investments, at fair value 476.9 413.5
Commercial mortgage-backed securities    
Assets measured at fair value    
Fixed maturity investments, at fair value 113.6 115.9
Non-U.S. government and government agency    
Assets measured at fair value    
Fixed maturity investments, at fair value 38.5 50.3
Preferred stocks    
Assets measured at fair value    
Fixed maturity investments, at fair value 2.5 8.5
U.S. States, municipalities, and political subdivision    
Assets measured at fair value    
Fixed maturity investments, at fair value 2.6 2.8
Hedge funds and private equity funds    
Liabilities measured at fair value    
Fair value of hedges 301.7 301.4
Level 1    
Assets measured at fair value    
Fixed maturity investments, at fair value 190.9 207.6
Short-term investments 792.5 679.3
Equity securities 393.5 380.0
Total investments 1,376.9 1,266.9
Derivative instruments 0.5  
Total assets measured at fair value 1,377.4 1,266.9
Liabilities measured at fair value    
Derivative instruments 0.2 0.5
Total liabilities measured at fair value 0.2 0.5
Level 1 | U.S. government and government agency    
Assets measured at fair value    
Fixed maturity investments, at fair value 157.0 164.7
Level 1 | Non-U.S. government and government agency    
Assets measured at fair value    
Fixed maturity investments, at fair value 33.9 42.9
Level 2    
Assets measured at fair value    
Fixed maturity investments, at fair value 1,655.5 1,736.2
Short-term investments 41.1 36.2
Equity securities 0.9  
Total investments 1,697.5 1,772.4
Total assets measured at fair value 1,697.5 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 628.1 695.8
Level 2 | Residential mortgage-backed securities    
Assets measured at fair value    
Fixed maturity investments, at fair value 425.8 494.5
Level 2 | Asset-backed securities    
Assets measured at fair value    
Fixed maturity investments, at fair value 476.9 413.5
Level 2 | Commercial mortgage-backed securities    
Assets measured at fair value    
Fixed maturity investments, at fair value 113.6 115.9
Level 2 | Non-U.S. government and government agency    
Assets measured at fair value    
Fixed maturity investments, at fair value 4.6 7.4
Level 2 | Preferred stocks    
Assets measured at fair value    
Fixed maturity investments, at fair value 2.5 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 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 0.3 4.1
Total assets measured at fair value 88.3 73.1
Liabilities measured at fair value    
Contingent consideration liabilities 28.8 28.8
Derivative instruments 5.1 4.6
Total liabilities measured at fair value $ 33.9 33.4
Level 3 | Preferred stocks    
Assets measured at fair value    
Fixed maturity investments, at fair value   $ 5.4