Defined Benefit Plans - Reconciliation of Level Three Measurements (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Beginning balance	$ 64.5	$ 63.8
Actual return on assets related to assets still held	4.0	5.7
Purchases, sales and settlements		(5.0)
Ending balance	68.5	64.5
Group annuity/insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Beginning balance	21.2	20.6
Actual return on assets related to assets still held	0.6	0.6
Ending balance	21.8	21.2
Commingled Funds \| Multi-strategy hedge funds
Defined Benefit Plan Disclosure [Line Items]
Beginning balance	20.5	18.8
Actual return on assets related to assets still held	1.1	1.7
Ending balance	21.6	20.5
Commingled Funds \| Real estate
Defined Benefit Plan Disclosure [Line Items]
Beginning balance	22.8	24.4
Actual return on assets related to assets still held	2.3	3.4
Purchases, sales and settlements		(5.0)
Ending balance	$ 25.1	$ 22.8

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Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

Amount of purchases, (sales), issuances and (settlements) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph c

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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