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Share-based compensation Additional Information (Details) $ in Millions |  | 12 Months Ended
--- | --- | ---
Mar. 01, 2014 shares | Dec. 31, 2014 USD ($) increment shares | Dec. 31, 2013 USD ($) shares | Dec. 31, 2012 USD ($) shares
Share-based compensation |  |  |  |
Income tax benefit (in dollars) |  | $ 3.4 | $ 2.8 | $ 2.4
Equity and Incentive Plan (EIP) |  |  |  |
Share-based compensation |  |  |  |
Additional shares available for issuance | shares | 1,500,000 |  |  |
Shares remaining available for future issuance | shares |  | 3,600,000 |  |
Shares that can be issued upon vesting of outstanding units and achievement of performance goals | shares |  | 900,000 |  |
Stock Option and Incentive Plan (SOIP) |  |  |  |
Share-based compensation |  |  |  |
Outstanding shares | shares |  | 17,000 |  |
Period of time from grant date after which awards become unrestricted |  | 4 years |  |
Nonemployee Director Stock Plan |  |  |  |
Share-based compensation |  |  |  |
Shares remaining available for future issuance | shares |  | 169,290 |  |
Long-term incentive plan (LTIP) |  |  |  |
Share-based compensation |  |  |  |
Performance period |  | 3 years |  |
Exception to forfeiture, minimum requisite service period |  | 12 months |  |
Payout low end of range (as a percent) |  | 0.00% |  |
Payout high end of range (as a percent) |  | 200.00% |  |
Stock appreciation rights (SARs) |  |  |  |
Share-based compensation |  |  |  |
Intrinsic value of equity instruments other than options, vested |  | $ 0.6 |  |
Expired (in shares) | shares |  | 0 | 0 | 4,000
Stock appreciation rights (SARs) | Stock Option and Incentive Plan (SOIP) |  |  |  |
Share-based compensation |  |  |  |
Percentage of award exercisable in installments |  | 25.00% |  |
Period during which the award vests and becomes exercisable in installments |  | 4 years |  |
Period award expires if not exercised |  | 10 years |  |
Restricted shares |  |  |  |
Share-based compensation |  |  |  |
Fair value of vested stock (in dollars) |  | $ 0.1 | $ 0.1 | $ 0.9
Income tax benefit (in dollars) |  |  |  | $ 0.2
Shares vested | shares |  | 4,503 | 4,502 | 37,802
Restricted shares | Equity and Incentive Plan (EIP) |  |  |  |
Share-based compensation |  |  |  |
The number of equal annual increments for which the awards become unrestricted (in installments) | increment |  | 4 |  |
Restricted stock units |  |  |  |
Share-based compensation |  |  |  |
Fair value of vested stock (in dollars) |  | $ 4.1 | $ 3.7 | $ 0.7
Income tax benefit (in dollars) |  | 1.2 | $ 0.9 | $ 0.2
Unrecognized compensation cost |  | $ 4.4 |  |
Weighted-average period over which unrecognized compensation cost expected to be recognized |  | 2 years 5 months 24 days |  |
Shares vested | shares |  | 144,702 | 118,885 | 25,728
LTIP linked to TRS |  |  |  |
Share-based compensation |  |  |  |
Fair value of vested stock (in dollars) |  | $ 0.0 | $ 2.2 | $ 0.6
Income tax benefit (in dollars) |  | 0.0 | $ 0.9 | $ 0.2
Unrecognized compensation cost |  | $ 2.2 |  |
Weighted-average period over which unrecognized compensation cost expected to be recognized |  | 1 year 6 months |  |
Shares vested | shares |  | 70,189 | 87,753 | 35,397
Shares settled | shares |  | 70,205 |  |
Expired (in shares) | shares |  | 17,548 |  |
LTIP awards linked to other performance conditions |  |  |  |
Share-based compensation |  |  |  |
Fair value of vested stock (in dollars) |  | $ 1.9 | $ 0.6 |
Income tax benefit (in dollars) |  | $ 0.8 | $ 0.2 |
Shares vested | shares |  | 65,089 | 18,280 | 0
2012-2014 LTIP linked to other performance conditions |  |  |  |
Share-based compensation |  |  |  |
Unrecognized compensation cost |  | $ 3.4 |  |
Weighted-average period over which unrecognized compensation cost expected to be recognized |  | 1 year 6 months |  |

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