Commitments and contingencies (Tables)

3 Months Ended

Mar. 31, 2019

Commitments and contingencies

Schedule of lease balances within the Consolidated Balance Sheets

(millions)	Balance Sheet Classification	March 31, 2019
Operating lease right-of-use assets	Other assets	$	32.0
Current lease liabilities	Other liabilities	$	9.8
Non-current lease liabilities	Other liabilities	$	24.1

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

Weighted average lease term (years) as at March 31, 2019:
Leased offices	7.0 years
Leased equipment	3.0 years
Weighted average discount rate:
Leased offices	3.8	%
Leased equipment	3.4	%

Schedule of future annual minimum rental payments required under non cancellable leases for office space

(Millions)	Future Payments
2019	$	7.7
2020		8.9
2021		7.4
2022		6.6
2023		4.2
2024 and after		2.0
Total future annual minimum rental payments as at March 31, 2019		36.8
Less: present value discount		(2.9)
Total lease liability as at March 31, 2019	$	33.9