Unaudited Pro Forma Financial Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Business Acquisition, Pro Forma Information [Line Items]
Net sales	$ 2,328.3	$ 2,315.7	$ 6,421.1	$ 6,330.1
Net income	$ 112.3	$ 112.7	$ 147.8	$ 144.6
Earnings per share:
Basic	$ 0.55	$ 0.56	$ 0.72	$ 0.71
Diluted	$ 0.52	$ 0.55	$ 0.69	$ 0.70

Business Acquisition, Pro Forma, Earnings Per Share [Abstract]

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- Definition

Business Acquisition, Pro Forma Information [Line Items]

+ References

No definition available.

+ Details

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- Definition

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(2)-(3)

-URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463

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- Definition

The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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- Definition

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

+ Details

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- Definition

The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

+ Details

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