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Commitments and contingencies (Tables)
 12 Months Ended
Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]  
Schedule of gross reinsurance premiums written by intermediaries
Gross written premium by intermediary
2019
2018
2017
AON Corporation and subsidiaries
24
%
26
%
22
%
Guy Carpenter & Company and subsidiaries
24
%
26
%
25
%
WT Butler and Co. Ltd.
11
%
10
%
10
%
Willis Towers Watson plc and subsidiaries
10
%
8
%
8
%
Total
69
%
70
%
65
%
Schedule of net written premiums by geographic region
(Millions)
2019
2018
2017
United States
$
922.3

$
794.7

$
563.1

Europe
268.9

276.5

262.3

Canada, the Caribbean, Bermuda and Latin America
102.5

103.6

111.4

Asia and Other
208.9

182.3

153.4

Total
$
1,502.6

$
1,357.1

$
1,090.2
Schedule of lease balances within the Consolidated Balance Sheets
The following table presents the lease balances within the Consolidated Balance Sheets as of December 31, 2019:
(millions)
Balance Sheet Classification
December 31, 2019

Operating lease right-of-use assets
Other assets
$
27.4

Current lease liabilities
Other liabilities
$
8.3

Non-current lease liabilities
Other liabilities
$
21.0
Schedule of weighted average remaining lease term and weighted average discount rate
The following table presents weighted average remaining lease term and weighted average discount rate as at December 31, 2019:
Weighted average lease term (years) as of December 31, 2019
 
Leased offices
7 years

Leased equipment
3 years

Weighted average discount rate:
 
Leased offices
3.7
%
Leased equipment
3.4
%
Schedule of future annual minimum rental payments required under non cancellable leases for office space
The following table presents future annual minimum rental payments required under non-cancellable leases and the present value discount to arrive at total lease liability as of December 31, 2019:
(Millions)
Future Payments

2020
$
9.3

2021
8.0

2022
7.1

2023
4.4

2024
2.0

2025
0.6

2026 and after
0.2

Total future annual minimum rental payments as at December 31, 2019
31.6

Less: present value discount
(2.3
)
Total lease liability as of December 31, 2019
$
29.3