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Retirement Plans and Other Post-Retirement Benefits - Summary of Amounts Recognized in Consolidated Balance Sheets (Detail) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
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Pension Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net amount recognized | $ 58.7 | $ 53.0
Other Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net amount recognized | (47.9) | (50.9)
Other Assets [Member] | Pension Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net amount recognized | 96.7 | 89.1
Current Liabilities [Member] | Pension Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net amount recognized | (2.0) | (2.1)
Current Liabilities [Member] | Other Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net amount recognized | (3.2) | (3.2)
Other Long-Term Liabilities [Member] | Pension Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net amount recognized | (36.0) | (34.0)
Other Long-Term Liabilities [Member] | Other Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net amount recognized | $ (44.7) | $ (47.7)

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- Definition The aggregate net amount recognized in the balance sheet associated with the defined benefit plan(s). Will normally be the same as the Defined Benefit Plan, Funded Status of Plan, Total. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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