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Share-based compensation - Summary of changes in share based compensation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Restricted stock units
Restricted stock awards and restricted stock units
Outstanding, beginning of period (in shares)	208,088	236,036	197,047	220,683
Granted (in shares)	3,159	896	92,064	97,873
Vested (in shares)	(448)	(7,370)	(75,683)	(88,994)
Forfeited (in shares)	(9,943)	(23,079)	(12,572)	(23,079)
Outstanding, end of period (in shares)	200,856	206,483	200,856	206,483
Weighted-average grant-date fair value per share
Outstanding, beginning of period (in dollars per share)	$ 32.97	$ 31.42	$ 31.53	$ 29.57
Granted (in dollars per share)	33.78	33.06	34.09	33.47
Vested (in dollars per share)	31.94	29.17	30.56	28.88
Forfeited (in dollars per share)	32.05	31.50	32.27	31.50
Outstanding, end of period (in dollars per share)	$ 33.03	$ 31.50	$ 33.03	$ 31.50
Total weighted-average grant-date fair value	$ 0.1	$ 0.0	$ 3.1	$ 3.3
LTIP linked to TRS
Restricted stock awards and restricted stock units
Outstanding, beginning of period (in shares)	66,791	36,971	32,904	83,106
Granted (in shares)	1,315	233	36,941	37,204
Vested (in shares)	0	0	0	(83,106)
Forfeited (in shares)	(1,929)	(3,434)	(3,668)	(3,434)
Outstanding, end of period (in shares)	66,177	33,770	66,177	33,770
Weighted-average grant-date fair value per share
Outstanding, beginning of period (in dollars per share)	$ 38.84	$ 39.51	$ 39.51	$ 22.95
Granted (in dollars per share)	38.20	39.51	38.21	39.51
Vested (in dollars per share)	0.00	0.00	0.00	22.95
Forfeited (in dollars per share)	38.85	39.51	38.84	39.51
Outstanding, end of period (in dollars per share)	$ 38.82	$ 39.51	$ 38.82	$ 39.51
Total weighted-average grant-date fair value	$ 0.1	$ 0.0	$ 1.4	$ 1.5
LTIP awards linked to other performance conditions
Restricted stock awards and restricted stock units
Outstanding, beginning of period (in shares)	267,167	147,888	131,616	109,816
Granted (in shares)	5,257	930	147,766	148,818
Vested (in shares)	0	0	0	(109,816)
Forfeited (in shares)	(7,717)	(13,740)	(14,675)	(13,740)
Outstanding, end of period (in shares)	264,707	135,078	264,707	135,078
Weighted-average grant-date fair value per share
Outstanding, beginning of period (in dollars per share)	$ 33.80	$ 33.48	$ 33.47	$ 25.18
Granted (in dollars per share)	33.52	32.58	34.08	33.47
Vested (in dollars per share)	0.00	0.00	0.00	25.18
Forfeited (in dollars per share)	33.80	33.48	33.80	33.48
Outstanding, end of period (in dollars per share)	$ 33.79	$ 33.47	$ 33.79	$ 33.47
Total weighted-average grant-date fair value	$ 0.2	$ 0.0	$ 5.0	$ 5.0

X

- Definition

Represents the weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect during the reporting period as a result of the occurrence of a terminating event specified in the contractual agreement of the plan or when performance conditions met.

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Represents the total weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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