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Fair value measurements - Rollforward of Level 3 Fair Value Measurements (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Rollforward of Level 3 Fair Value Measurements        
Transfers from Level 2 to Level 3, Assets $ 0.0 $ 0.0 $ 0.0 $ 0.0
Transfers out 0.0 0.0 0.0 0.0
Rollforward of Level 3, Derivative instruments assets & (liabilities)        
Balance at beginning of the period (4.8) (6.1) (0.5) (6.1)
Total realized and unrealized gains (losses) (0.6) 5.6 (5.8) 5.6
Sales/Settlements 1.8 (5.3) 2.7 (5.3)
Balance at end of the period (3.6) (5.8) (3.6) (5.8)
Contingent consideration (liabilities)        
Rollforward of Level 3, (liabilities)        
Balance at beginning of the period (28.8) (42.8) (28.8) (42.8)
Fair value of contingent consideration liabilities at date of purchase (2.0)      
Total realized and unrealized gains (losses)     (2.0)  
Balance at end of the period (30.8) (42.8) (30.8) (42.8)
Fixed maturity investments        
Rollforward of Level 3 Fair Value Measurements        
Balance at beginning of the period   8.6 5.4 8.0
Total realized and unrealized gains (losses)   (2.1)   (2.1)
Purchases       0.6
Sales/Settlements   (0.5) (5.4) (0.5)
Balance at end of the period   6.0   6.0
Other long-term investments        
Rollforward of Level 3 Fair Value Measurements        
Balance at beginning of the period 88.0 64.9 63.6 64.2
Total realized and unrealized gains (losses)   8.5 9.3 9.3
Purchases   0.5 15.8 0.9
Sales/Settlements   (3.6)   (3.8)
Balance at end of the period 88.0 69.0 88.0 69.0
Other long-term investments | Foreign currency gains (losses)        
Rollforward of Level 3 Fair Value Measurements        
Gains (losses) through Other Comprehensive Income   (1.3) (0.7) (1.6)
Hedge funds and private equity funds        
Rollforward of Level 3, (liabilities)        
Fair value of hedges $ 291.9 $ 247.6 $ 291.9 $ 247.6