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Share-based compensation - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2015	Jul. 15, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unamortized share compensation expense	$ 7.1	$ 7.4
Unamortized share compensation expense, period of recognition	1 year 6 months	1 year 4 months 24 days
Fair value assumptions
Aggregate intrinsic value of options outstanding	$ 2.4
Aggregate intrinsic value of options exercisable	2.4
Proceeds from stock options exercised	1.9	$ 0.0
Defined Contribution Plan, Administrative Expense	$ 0.9	$ 0.9	$ 0.8
Non-Employee Directors
Fair value assumptions
Restricted stock awards issued	67,291	50,644	36,418
Employees
Fair value assumptions
Restricted stock awards issued	336,069	0	0
Management and director options
Fair value assumptions
Remaining contractual life	2 years 2 months 12 days	3 years 2 months 12 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	2 years 2 months 12 days	3 years 2 months 12 days
Management and director options | Management
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service condition met on each of first five anniversary dates following grant date	20.00%
Award vesting period	5 years
Restricted share awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period				3 years
Omnibus plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)					21,627,906
Number of shares available for future issuance (in shares)	9,006,995	9,017,930

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Aggregate number of common shares reserved for future issuance.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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