Commitments and contingencies (Tables)

6 Months Ended

Jun. 30, 2019

Commitments and contingencies

Schedule of lease balances within the Consolidated Balance Sheets

(millions)	Balance Sheet Classification	June 30, 2019
Operating lease right-of-use assets	Other assets	$	31.5
Current lease liabilities	Other liabilities	$	8.9
Non-current lease liabilities	Other liabilities	$	24.6

Schedule of weighted average remaining lease term and weighted average discount rate

Weighted average lease term (years) as at June 30, 2019:
Leased offices	7.0	years
Leased equipment	3.0	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

(Millions)	Future Payments
2019	$	5.0
2020		9.2
2021		7.9
2022		7.0
2023		4.3
2024 and after		2.8
Total future annual minimum rental payments as at  June 30, 2019		36.2
Less: present value discount		(2.7)
Total lease liability as at June 30, 2019	$	33.5