Investment securities - Fixed maturity investments (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2020	Dec. 31, 2019
Fixed maturity investments
Cost or amortized cost	$ 1,932.7	$ 1,656.6
Gross unrealized gains	48.1	18.7
Gross unrealized (losses)	(16.0)	(8.2)
Net foreign currency gains (losses)	(5.9)	13.9
Fair value	$ 1,958.9	1,681.0
Weighted average duration of fixed income portfolio including short-term investments	1 year 1 month 6 days
Weighted average duration of fixed income portfolio excluding short-term investments	1 year 7 months 6 days
Cost or amortized cost
Due in one year or less	$ 203.2	85.0
Due after one year through five years	406.7	479.1
Due after five years through ten years	41.0	46.3
Due after ten years	12.3	25.1
Fair value
Due in one year or less	212.2	88.4
Due after one year through five years	404.4	490.3
Due after five years through ten years	41.7	46.0
Due after ten years	12.4	24.6
Fixed maturity investments
Fixed maturity investments
Fair value	1,958.9	1,681.0
Fixed maturity investments \| AAA
Fixed maturity investments
Fair value	807.8	559.8
Fixed maturity investments \| AA
Fixed maturity investments
Fair value	734.4	724.3
Fixed maturity investments \| A
Fixed maturity investments
Fair value	213.7	219.0
Fixed maturity investments \| BBB
Fixed maturity investments
Fair value	99.2	95.8
Fixed maturity investments \| Other
Fixed maturity investments
Fair value	103.8	82.1
Corporate debt securities
Fixed maturity investments
Cost or amortized cost	471.4	458.6
Gross unrealized gains	10.0	5.2
Gross unrealized (losses)	(0.8)	(1.2)
Net foreign currency gains (losses)	1.3	11.5
Fair value	481.9	474.1
Asset-backed securities
Fixed maturity investments
Cost or amortized cost	740.0	489.4
Gross unrealized gains	8.4	1.4
Gross unrealized (losses)	(12.4)	(3.9)
Net foreign currency gains (losses)	(4.4)	(0.1)
Fair value	731.6	486.8
Residential mortgage-backed securities
Fixed maturity investments
Cost or amortized cost	393.8	426.2
Gross unrealized gains	22.2	10.5
Gross unrealized (losses)	(0.9)	(1.4)
Net foreign currency gains (losses)	1.4	3.6
Fair value	416.5	438.9
U.S. Government and government agency
Fixed maturity investments
Cost or amortized cost	119.2	111.5
Gross unrealized gains	0.8	0.7
Gross unrealized (losses)	0.0	(0.4)
Net foreign currency gains (losses)	(3.6)	(1.3)
Fair value	116.4	110.5
Commercial mortgage-backed securities
Fixed maturity investments
Cost or amortized cost	120.8	88.5
Gross unrealized gains	3.1	0.9
Gross unrealized (losses)	(1.7)	(0.6)
Net foreign currency gains (losses)	0.0	0.2
Fair value	122.2	89.0
Non-U.S. government and government agency
Fixed maturity investments
Cost or amortized cost	71.4	63.7
Gross unrealized gains	0.4	0.0
Gross unrealized (losses)	(0.1)	(0.7)
Net foreign currency gains (losses)	(0.6)	0.0
Fair value	71.1	63.0
Preferred stocks
Fixed maturity investments
Cost or amortized cost	14.9	17.0
Gross unrealized gains	3.1	0.0
Gross unrealized (losses)	(0.1)	0.0
Net foreign currency gains (losses)	0.0	0.0
Fair value	17.9	17.0
Cost or amortized cost
Cost or amortized cost without single maturity date	14.9	17.0
Fair value
Fair value without single maturity date	17.9	17.0
U.S. States, municipalities and political subdivision
Fixed maturity investments
Cost or amortized cost	1.2	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	1.3	1.7
Mortgage-backed and asset-backed securities
Cost or amortized cost
Cost or amortized cost without single maturity date	1,254.6	1,004.1
Fair value
Fair value without single maturity date	1,270.3	1,014.7
Subprime \| Fixed maturity investments
Fixed maturity investments
Fair value	43.8	43.3
Subprime \| Fixed maturity investments \| AAA
Fixed maturity investments
Fair value	21.5	21.7
Subprime \| Fixed maturity investments \| AA
Fixed maturity investments
Fair value	18.7	18.4
Subprime \| Fixed maturity investments \| A
Fixed maturity investments
Fair value	3.5	3.1
Subprime \| Fixed maturity investments \| Other
Fixed maturity investments
Fair value	$ 0.1	$ 0.1

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Data Type:	na
Balance Type:
Period Type: