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Postretirement Benefit Plans - Summary of Funded Status of Postretirement Benefit Plans and Presentation of Such Balances within Consolidated Balance Sheet (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 326.7 | $ 269.2 | $ 286.9
Projected benefit obligation | 557.1 | 531.0 | 561.3
Funded status | (230.4) | (261.8) |
Pension and Other Postretirement Defined Benefit Plans, Assets, Noncurrent | 10.3 | 0.0 |
Amounts reported within: |  |  |
Accrued liabilities | (13.4) | (13.2) |
Non-current liabilities | (227.3) | (248.6) |
Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 321.5 | 263.1 |
Projected benefit obligation | 419.0 | 392.2 |
Funded status | (97.5) | (129.1) |
Pension and Other Postretirement Defined Benefit Plans, Assets, Noncurrent | 10.3 | 0.0 |
Amounts reported within: |  |  |
Accrued liabilities | (4.8) | (3.7) |
Non-current liabilities | (103.0) | (125.4) |
Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 5.2 | 6.1 | 7.9
Projected benefit obligation | 138.1 | 138.8 | $ 143.4
Funded status | (132.9) | (132.7) |
Pension and Other Postretirement Defined Benefit Plans, Assets, Noncurrent | 0.0 | 0.0 |
Amounts reported within: |  |  |
Accrued liabilities | (8.6) | (9.5) |
Non-current liabilities | $ (124.3) | $ (123.2) |

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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + 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 (a) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status. + 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 (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: 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 + Details
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