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Share-based compensation (Details 3) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Weighted-average grant-date fair value per share |  |
Tax benefits realized for the tax deductions | $ 0.8 | $ 0.8
Restricted shares |  |
Restricted stock awards and restricted stock units |  |
Outstanding, beginning of period (in shares) | 4,503 |
Outstanding, end of period (in shares) | 4,503 |
Weighted-average grant-date fair value per share |  |
Outstanding, beginning of period (in dollars per share) | $ 22.21 |
Outstanding, end of period (in dollars per share) | $ 22.21 |
Unrecognized compensation cost | 0.1 |
Weighted-average period over which unrecognized compensation cost expected to be recognized | 8 months 12 days |
Restricted stock units |  |
Restricted stock awards and restricted stock units |  |
Outstanding, beginning of period (in shares) | 288,151 | 315,094
Granted (in shares) | 115,036 | 107,231
Vested (in shares) | (71,029) | (113,212)
Forfeited (in shares) | 0 | (7,968)
Outstanding, end of period (in shares) | 332,158 | 301,145
Weighted-average grant-date fair value per share |  |
Outstanding, beginning of period (in dollars per share) | $ 25.17 | $ 22.82
Granted (in dollars per share) | $ 25.19 | $ 26.89
Vested (in dollars per share) | $ 25.79 | $ 20.30
Forfeited (in dollars per share) | $ 0.00 | $ 25.26
Outstanding, end of period (in dollars per share) | $ 25.04 | $ 25.15
Total weighted-average grant-date fair value | 2.9 | 2.9
Unrecognized compensation cost | 6.3 |
Weighted-average period over which unrecognized compensation cost expected to be recognized | 3 years |
Fair value of vested stock (in dollars) | 2.0 | 3.5
Tax benefits realized for the tax deductions | 0.7 | 1.1
LTIP linked to TRS |  |
Restricted stock awards and restricted stock units |  |
Outstanding, beginning of period (in shares) | 232,127 | 239,256
Granted (in shares) | 96,793 | 89,533
Vested (in shares) | (70,189) | (87,753)
Forfeited (in shares) | (488) | (5,972)
Outstanding, end of period (in shares) | 258,243 | 235,064
Weighted-average grant-date fair value per share |  |
Outstanding, beginning of period (in dollars per share) | $ 32.88 | $ 29.12
Granted (in dollars per share) | $ 22.95 | $ 32.69
Vested (in dollars per share) | $ 35.46 | $ 22.45
Forfeited (in dollars per share) | $ 32.13 | $ 32.96
Outstanding, end of period (in dollars per share) | $ 28.46 | $ 32.87
Total weighted-average grant-date fair value | 2.2 | 2.9
Unrecognized compensation cost | 3.8 |
Weighted-average period over which unrecognized compensation cost expected to be recognized | 1 year 9 months 18 days |
Fair value of vested stock (in dollars) |  | 2.2
Tax benefits realized for the tax deductions |  | 0.9
LTIP awards linked to other performance conditions |  |
Restricted stock awards and restricted stock units |  |
Outstanding, beginning of period (in shares) | 296,843 | 247,175
Granted (in shares) | 128,873 | 118,895
Vested (in shares) | (65,089) | (18,275)
Forfeited (in shares) | (557) | (5,971)
Outstanding, end of period (in shares) | 360,070 | 341,824
Weighted-average grant-date fair value per share |  |
Outstanding, beginning of period (in dollars per share) | $ 26.14 | $ 25.04
Granted (in dollars per share) | $ 25.19 | $ 26.89
Vested (in dollars per share) | $ 24.95 | $ 18.95
Forfeited (in dollars per share) | $ 26.55 | $ 25.94
Outstanding, end of period (in dollars per share) | $ 26.01 | $ 26.00
Total weighted-average grant-date fair value | 3.2 | 3.2
Unrecognized compensation cost | 5.5 |
Weighted-average period over which unrecognized compensation cost expected to be recognized | 1 year 9 months 18 days |
Fair value of vested stock (in dollars) | 1.9 | 0.6
Tax benefits realized for the tax deductions | $ 0.8 | $ 0.2

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. + References No definition available. + Details
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- Definition 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). + References No definition available. + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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