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Postretirement Benefit Plans - Fair Value of Plan Assets Held by Our Postretirement Benefits Plans (Detail) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan asset |  | $ 286.9 | $ 283.4 | $ 278.0
Pension [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan asset |  | 279.0 | 273.9 |
Pension [Member] | U.S. [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan asset |  | 85.8 | 97.6 |
Pension [Member] | International [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan asset |  | 46.3 | 53.0 |
Pension [Member] | Emerging Markets [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan asset |  | 18.9 | 24.9 |
Pension [Member] | Fixed income [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan asset |  | 121.1 | 97.1 |
Pension [Member] | Cash and other [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan asset |  | 6.9 | 1.3 |
Pension [Member] | Level 2 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan asset |  | 275.0 | 273.9 |
Pension [Member] | Level 2 [Member] | U.S. [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan asset |  | 85.8 | 97.6 |
Pension [Member] | Level 2 [Member] | International [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan asset |  | 46.3 | 53.0 |
Pension [Member] | Level 2 [Member] | Emerging Markets [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan asset |  | 18.9 | 24.9 |
Pension [Member] | Level 2 [Member] | Fixed income [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan asset |  | 121.1 | 97.1 |
Pension [Member] | Level 2 [Member] | Cash and other [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan asset |  | 2.9 | 1.3 |
Pension [Member] | Level 3 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan asset |  | 4.0 |  |
Pension [Member] | Level 3 [Member] | U.S. [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan asset |  | 0.0 |  |
Pension [Member] | Level 3 [Member] | International [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan asset |  | 0.0 |  |
Pension [Member] | Level 3 [Member] | Emerging Markets [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan asset |  | 0.0 |  |
Pension [Member] | Level 3 [Member] | Fixed income [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan asset |  | 0.0 |  |
Pension [Member] | Level 3 [Member] | Cash and other [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan asset | [1] | 4.0 |  |
Other Postretirement Benefit Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan asset |  | 7.9 | 9.5 | $ 9.2
Other Postretirement Benefit Plan [Member] | U.S. [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan asset |  | 2.6 | 2.8 |
Other Postretirement Benefit Plan [Member] | International [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan asset |  | 1.9 | 1.9 |
Other Postretirement Benefit Plan [Member] | Emerging Markets [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan asset |  | 0.8 | 0.9 |
Other Postretirement Benefit Plan [Member] | Fixed income [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan asset |  | 2.6 | 2.8 |
Other Postretirement Benefit Plan [Member] | Cash and other [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan asset |  | 0.0 | 1.1 |
Other Postretirement Benefit Plan [Member] | Level 1 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan asset |  | 7.9 | 9.5 |
Other Postretirement Benefit Plan [Member] | Level 1 [Member] | U.S. [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan asset |  | 2.6 | 2.8 |
Other Postretirement Benefit Plan [Member] | Level 1 [Member] | International [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan asset |  | 1.9 | 1.9 |
Other Postretirement Benefit Plan [Member] | Level 1 [Member] | Emerging Markets [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan asset |  | 0.8 | 0.9 |
Other Postretirement Benefit Plan [Member] | Level 1 [Member] | Fixed income [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan asset |  | 2.6 | 2.8 |
Other Postretirement Benefit Plan [Member] | Level 1 [Member] | Cash and other [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan asset |  | $ 0.0 | $ 1.1 |
[1] | (a)Pension plan assets as of December 31, 2015 include an investment in a hedge fund acquired from Wolverine. The hedge fund is valued using broker quotes and classified within Level 3 of the fair value hierarchy due to the significance of unobservable inputs involved in the broker quote.

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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