Investment securities - Fixed maturity investments (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2020	Dec. 31, 2019
Fixed maturity investments
Cost or amortized cost	$ 1,877.7	$ 1,656.6
Gross unrealized gains	43.7	18.7
Gross unrealized (losses)	(23.0)	(8.2)
Net foreign currency gains (losses)	6.3	13.9
Fair value	$ 1,904.7	1,681.0
Weighted average duration of fixed income portfolio including short-term investments	1 year
Weighted average duration of fixed income portfolio excluding short-term investments	1 year 6 months
Cost or amortized cost
Due in one year or less	$ 127.3	85.0
Due after one year through five years	446.3	479.1
Due after five years through ten years	43.9	46.3
Due after ten years	8.2	25.1
Fair value
Due in one year or less	131.4	88.4
Due after one year through five years	456.2	490.3
Due after five years through ten years	44.3	46.0
Due after ten years	8.1	24.6
Fixed maturity investments
Fixed maturity investments
Fair value	1,904.7	1,681.0
Fixed maturity investments \| AAA
Fixed maturity investments
Fair value	785.6	559.8
Fixed maturity investments \| AA
Fixed maturity investments
Fair value	716.8	724.3
Fixed maturity investments \| A
Fixed maturity investments
Fair value	217.4	219.0
Fixed maturity investments \| BBB
Fixed maturity investments
Fair value	102.5	95.8
Fixed maturity investments \| Other
Fixed maturity investments
Fair value	82.4	82.1
Corporate debt securities
Fixed maturity investments
Cost or amortized cost	468.2	458.6
Gross unrealized gains	9.8	5.2
Gross unrealized (losses)	(0.8)	(1.2)
Net foreign currency gains (losses)	6.5	11.5
Fair value	483.7	474.1
Asset-backed securities
Fixed maturity investments
Cost or amortized cost	737.4	489.4
Gross unrealized gains	5.2	1.4
Gross unrealized (losses)	(18.5)	(3.9)
Net foreign currency gains (losses)	(0.9)	(0.1)
Fair value	723.2	486.8
Residential mortgage-backed securities
Fixed maturity investments
Cost or amortized cost	403.6	426.2
Gross unrealized gains	22.3	10.5
Gross unrealized (losses)	(0.8)	(1.4)
Net foreign currency gains (losses)	3.1	3.6
Fair value	428.2	438.9
U.S. Government and government agency
Fixed maturity investments
Cost or amortized cost	105.5	111.5
Gross unrealized gains	1.2	0.7
Gross unrealized (losses)	(0.1)	(0.4)
Net foreign currency gains (losses)	(2.1)	(1.3)
Fair value	104.5	110.5
Commercial mortgage-backed securities
Fixed maturity investments
Cost or amortized cost	96.2	88.5
Gross unrealized gains	2.5	0.9
Gross unrealized (losses)	(2.3)	(0.6)
Net foreign currency gains (losses)	0.1	0.2
Fair value	96.5	89.0
Non-U.S. government and government agency
Fixed maturity investments
Cost or amortized cost	50.4	63.7
Gross unrealized gains	0.3	0.0
Gross unrealized (losses)	(0.2)	(0.7)
Net foreign currency gains (losses)	(0.4)	0.0
Fair value	50.1	63.0
Preferred stocks
Fixed maturity investments
Cost or amortized cost	14.8	17.0
Gross unrealized gains	2.3	0.0
Gross unrealized (losses)	(0.3)	0.0
Net foreign currency gains (losses)	0.0	0.0
Fair value	16.8	17.0
Cost or amortized cost
Cost or amortized cost without single maturity date	14.8	17.0
Fair value
Fair value without single maturity date	16.8	17.0
U.S. States, municipalities and political subdivision
Fixed maturity investments
Cost or amortized cost	1.6	1.7
Gross unrealized gains	0.1	0.0
Gross unrealized (losses)	0.0	0.0
Net foreign currency gains (losses)	0.0	0.0
Fair value	1.7	1.7
Mortgage-backed and asset-backed securities
Cost or amortized cost
Cost or amortized cost without single maturity date	1,237.2	1,004.1
Fair value
Fair value without single maturity date	1,247.9	1,014.7
Subprime \| Fixed maturity investments
Fixed maturity investments
Fair value	41.2	43.3
Subprime \| Fixed maturity investments \| AAA
Fixed maturity investments
Fair value	21.8	21.7
Subprime \| Fixed maturity investments \| AA
Fixed maturity investments
Fair value	16.1	18.4
Subprime \| Fixed maturity investments \| A
Fixed maturity investments
Fair value	3.2	3.1
Subprime \| Fixed maturity investments \| Other
Fixed maturity investments
Fair value	$ 0.1	$ 0.1

Amount of foreign currency gain (loss) on investment in debt security measured at amortized cost (held-to-maturity).

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