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Retirement Benefits (Additional Information) (Detail) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2016 | Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |
Contributions by employer | $ 2.2 |
Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Expected contribution for next fiscal year |  | $ 6.1
Expected contributions in current fiscal year | 5.4 |
Other Postretirement Benefit Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Expected contribution for next fiscal year |  | $ 0.9
Expected contributions in current fiscal year | $ 0.9 |

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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=65897934&loc=d3e2709-114920 + Details
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