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Defined Benefit Plans - Pension Assets by Major Category of Plan Assets and Type of Fair Value Measurement (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	$ 577.7	$ 561.9
Group annuity/insurance contracts (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	22.8	22.3
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	6.9	5.8
Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	258.8	249.1
Fixed income
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	235.4	233.8
Multi-strategy hedge funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	23.1	22.3
Real estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	$ 30.7	$ 28.6

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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.

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Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

+ 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=64937038&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=65897934&loc=d3e1928-114920

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Plan Assets
-URI http://asc.fasb.org/extlink&oid=6749337

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Plan Assets
-URI http://asc.fasb.org/extlink&oid=6520858

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