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Retirement Benefits - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 employee | Dec. 31, 2012 | Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated benefit obligation for all defined benefit pension plans | $ 143.5 | $ 160.7 |
Percentage of excess gains and losses over benefit obligation or market value of assets amortized | 10.00% |  |
Costs of defined contribution plans | 8.4 | 7.9 | 7.8
Number of participants covering under multi employer pension plan | 393 |  |
Costs of bargaining unit-sponsored multi-employer plans and defined contribution plans | 1.1 | 1.0 | 1.0
Weighted average annual rate of increase in the per capita cost of covered health care benefits assumed | 7.27% |  |
Assumed decrease of weighted average health care cost trend rate | 4.49% |  |
Year that reaches assumed decrease of weighted average health care cost trend rate | 2027 |  |
Increase in service and interest cost components of the net periodic benefit cost, as 1% increase in health care cost trend rates | 0.2 |  |
Increase in accumulated postretirement benefit obligation, as 1% increase in health care cost trend rates | 1.4 |  |
Decrease in service and interest cost components of the net periodic benefit cost, as 1% decrease in health care cost trend rates | 0.2 |  |
Decrease in accumulated postretirement benefit obligation, as 1% decrease in health care cost trend rates | 1.2 |  |
Minimum fund performance period of plan assets | 3 years |  |
Maximum fund performance period of plan assets | 5 years |  |
Future estimated benefit payments for year 2013 | 9.1 |  |
Future estimated benefit payments for year 2014 | 8.5 |  |
Future estimated benefit payments for year 2015 | 9.0 |  |
Future estimated benefit payments for year 2016 | 9.4 |  |
Future estimated benefit payments for year 2017 | 9.9 |  |
Future estimated benefit payments for years 2018 to 2022 | 53.0 |  |
Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected contribution for next fiscal year | 2.8 |  |
Other Postretirement Benefit Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected contribution for next fiscal year | 0.9 |  |
Defined Contribution Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected contribution for next fiscal year | 8.4 |  |
Defined Contribution Pension Plan 401k |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected contribution for next fiscal year | $ 7.3 |  |
Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation of fund assets in equities, minimum | 50.00% |  |
Target allocation of fund assets in equities, maximum | 60.00% |  |
Target allocation of fund assets in equities | 50.00% |  |
Debt Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation of fund assets in equities, minimum | 40.00% |  |
Target allocation of fund assets in equities, maximum | 50.00% |  |
Target allocation of fund assets in equities | 50.00% |  |

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- Definition For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503844 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920 + Details
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