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Retirement Benefits (Additional Information) (Detail) (USD $) In Millions, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items] |  |
Anticipated contribution for current fiscal year | $ 0.9 |
Contributions by employer | 3.7 |
Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Expected contribution for next fiscal year |  | 2.8
Expected contributions in current fiscal year | 3.8 |
Other Postretirement Benefit Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Expected contribution for next fiscal year |  | 0.9
Expected contributions in current fiscal year | $ 0.8 |

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- Definition Amount of the employer's best estimate of contributions expected to be paid to the plan in the current fiscal period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2709-114920 + Details
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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. + 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 (g) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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