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Share-based compensation - Summary of changes in share based compensation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Share-based compensation
Income tax benefit from compensation expense	$ 0.5	$ 0.3	$ 1.2	$ 1.7
Weighted-average grant-date fair value per share
Total weighted-average grant-date fair value	$ 0.0	$ 0.0
Restricted stock units
Share-based compensation
Granted (in shares)	766	690	95,048	85,772
Fair value measurement of vested units and related dividends			$ 2.7	$ 3.7
Income tax benefit from compensation expense			$ 0.9	$ 1.1
Restricted stock awards and restricted stock units
Outstanding, beginning of period (in shares)	225,752	252,302	210,634	261,235
Granted (in shares)	766	690	95,048	85,772
Vested (in shares)	(4,419)	(19,840)	(83,583)	(99,891)
Forfeited (in shares)	(2,352)	(14,316)	(2,352)	(28,280)
Outstanding, end of period (in shares)	219,747	218,836	219,747	218,836
Weighted-average grant-date fair value per share
Outstanding, beginning of period (in dollars per share)	$ 29.59	$ 28.35	$ 28.82	$ 25.77
Granted (in dollars per share)	30.65	30.91	29.91	33.69
Vested (in dollars per share)	27.26	25.35	27.88	25.69
Forfeited (in dollars per share)	29.69	25.82	29.69	26.66
Outstanding, end of period (in dollars per share)	$ 29.64	$ 28.79	$ 29.64	$ 28.79
Total weighted-average grant-date fair value			$ 2.8	$ 2.9
LTIP linked to TRS
Share-based compensation
Granted (in shares)	0	0	0	0
Restricted stock awards and restricted stock units
Outstanding, beginning of period (in shares)	83,947	163,423	162,500	257,956
Granted (in shares)	0	0	0	0
Vested (in shares)	0	0	(78,553)	(75,915)
Forfeited (in shares)	(175)	0	(175)	(18,618)
Outstanding, end of period (in shares)	83,772	163,423	83,772	163,423
Weighted-average grant-date fair value per share
Outstanding, beginning of period (in dollars per share)	$ 22.95	$ 27.63	$ 27.66	$ 28.45
Granted (in dollars per share)	0.00	0.00	0.00	0.00
Vested (in dollars per share)	0.00	0.00	32.69	30.71
Forfeited (in dollars per share)	22.95	0.00	22.95	26.41
Outstanding, end of period (in dollars per share)	$ 22.95	$ 27.63	$ 22.95	$ 27.63
LTIP awards linked to other performance conditions
Share-based compensation
Granted (in shares)	0	0	0	0
Fair value measurement of vested units and related dividends			$ 3.6	$ 4.7
Income tax benefit from compensation expense			$ 1.4	$ 1.8
Restricted stock awards and restricted stock units
Outstanding, beginning of period (in shares)	113,550	220,158	222,647	364,731
Granted (in shares)	0	0	0	0
Vested (in shares)	0	0	(109,097)	(121,249)
Cancelled (in shares)	0	(14,050)	0	(14,050)
Forfeited (in shares)	(699)	0	(699)	(23,324)
Outstanding, end of period (in shares)	112,851	206,108	112,851	206,108
Weighted-average grant-date fair value per share
Outstanding, beginning of period (in dollars per share)	$ 25.18	$ 26.00	$ 26.02	$ 26.01
Granted (in dollars per share)	0.00	0.00	0.00	0.00
Vested (in dollars per share)	0.00	0.00	26.89	26.05
Cancelled (in dollars per share)	0.00	26.89	0.00	26.89
Forfeited (in dollars per share)	25.19	0.00	25.19	25.85
Outstanding, end of period (in dollars per share)	$ 25.18	$ 25.94	$ 25.18	$ 25.94
Nonemployee Director Stock Plan | Stock Compensation Plan
Share-based compensation
Granted (in shares)			19,846	28,246
Fair value measurement of vested units and related dividends			$ 0.6	$ 0.8
Income tax benefit from compensation expense			$ 0.2	$ 0.3
Restricted stock awards and restricted stock units
Granted (in shares)			19,846	28,246

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

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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 cancelled in during the period.

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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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- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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-Publisher FASB
-Name Accounting Standards Codification
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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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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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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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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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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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