Commitment and contingencies (Tables)

12 Months Ended

Dec. 31, 2021

Commitments and Contingencies Disclosure [Abstract]

Schedules of concentration risk by risk factor

The following table sets forth the Company’s premiums written by source that individually contributed more than 10% of total gross premiums written for the years ended December 31, 2021, 2020 and 2019:

	2021				2020				2019
Aon Corporation and subsidiaries	$	536.6	24.0	%	$	189.1	32.1	%	$	197.1	29.5	%
Guy Carpenter & Company and subsidiaries	414.1		18.5	%	164.6		28.0	%	144.6		21.6	%
Arthur J. Gallagher & Co. and subsidiaries	244.2		10.9	%	67.6		11.5	%	140.2		21.0	%
Other	1,041.6		46.6	%	167.2		28.4	%	186.5		27.9	%
	$	2,236.5	100.0	%	$	588.5	100.0	%	$	668.4	100.0	%

Schedule of lease balances

The following table presents the lease balances within the consolidated balance sheets as of December 31, 2021 and 2020:

	December 31, 2021			December 31, 2020
Operating lease right-of-use assets	$	27.4		$	0.8
Operating lease liabilities	$	32.5		$	0.8
Weighted average lease term (years)	5.0			1.0
Weighted average discount rate	2.4		%	7.0		%

Schedule of future minimum rental commitments

Future minimum rental commitments as of December 31, 2021 under these leases are expected to be as follows:

	Future Payments
2022	$	10.4
2023	7.9
2024	4.6
2025	3.2
2026 and thereafter	8.2
Total future annual minimum rental payments	34.3
Less: present value discount	(1.8)
Total lease liability as of December 31, 2021	$	32.5