Commitments and Contingencies - Roll forward of Asbestos Liability and Related Assets (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Changes in estimate during the period:
Noncurrent portion	$ 1,116.6	$ 1,179.6
Asbestos Related Matters [Member]
Liability for Asbestos and Environmental Claims, Net [Roll Forward]
Net Balance, Beginning	746.9	739.5
Changes in estimate during the period:
Continuing operations	6.1	63.8
Settlement Agreement	2.2	(31.0)
Reduction In Net Asbestos Liability Included In Continued Operation	0	31.0	5.8
Net cash activity	(4.0)	(25.4)
Balance, Ending		746.9	739.5
Estimated asbestos exposure, net of expected recoveries from insurers and other responsible parties	746.8	746.9
Asbestos Related Matters [Member] \| Liability [Member]
Liability for Asbestos and Environmental Claims, Net [Roll Forward]
Balance, Beginning	1,264.7	1,347.4
Changes in estimate during the period:
Continuing operations	32.4	11.4
Settlement Agreement	0
Net cash activity	(73.9)	(94.1)
Balance, Ending	1,223.2	1,264.7
Asbestos Liability Gross Current Ending Balance	106.6	85.1
Noncurrent portion	1,116.6	1,179.6
Asbestos Related Matters [Member] \| Asset [Member]
Liability for Asbestos and Environmental Claims, Net [Roll Forward]
Balance, Beginning	517.8	607.9
Changes in estimate during the period:
Continuing operations	26.3	(52.4)
Increase in asbestos related assets	2.2
Net cash activity	69.9	68.7
Balance, Ending	476.4	517.8
Current portion	(102.4)	(84.5)
Noncurrent portion	$ 374.0	$ 433.3

Asbestos Asset Gross Current and Non-current Beginning Balance

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Asbestos Asset Gross Current and Non-current Ending Balance

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Asbestos Liability and Related Assets Net Current and Noncurrent

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Asbestos Liability Gross Current and Non-current Beginning Balance

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Asbestos Liability Gross Current and Non-current Ending Balance

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Asbestos Liability Gross Current Ending Balance

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Changes in accruals during period continuing operations.

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- Definition

Estimated asbestos exposure, net of expected recoveries from insurers and other responsible parties.

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- Definition

The payments made in the period which reduced asbestos loss contingency reserves, net of associated insurance reimbursements.

+ References

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Increase in asbestos-related assets.

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Loss Contingency Settlement Agreement Amount

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Reduction In Net Asbestos Liability Included In Continued Operation

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Amount of loss contingency liability expected to be resolved after one year or beyond the normal operating cycle, if longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

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Amount of receivable related to a loss contingency accrual that is expected to be collected within one year or the normal operating cycle, if longer. For example, an insurance recovery receivable.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12053-110248

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Amount of additions to receivables pertaining to a loss contingency.

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