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Pension Plans - Fair Value of Pension Assets (Detail) - United Kingdom Plan [Member] - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fair value of pension assets
Total assets at fair value	$ 692.4	$ 763.2
Cash	65.8	32.0
Total plan assets	758.2	795.2	$ 862.3
Derivatives (Level 1 Measurement) [Member]
Fair value of pension assets
Total assets at fair value	461.6	512.1
Cash	65.8	32.0
Total plan assets	527.4	544.1
Significant Other Observable Inputs (Level 2) [Member]
Fair value of pension assets
Total assets at fair value	26.2	31.6
Total plan assets	26.2	31.6
Non-financial Assets and Liabilities (Level 3 Measurement) [Member]
Fair value of pension assets
Total assets at fair value	152.9	171.9
Total plan assets	152.9	171.9
Debt Securities Issued by U.S. Government and Government Agencies [Member]
Fair value of pension assets
Total assets at fair value	0.2	0.4
Debt Securities Issued by U.S. Government and Government Agencies [Member] | Derivatives (Level 1 Measurement) [Member]
Fair value of pension assets
Total assets at fair value	0.2	0.4
Debt Securities Issued by Non-U.S. Government and Government Agencies [Member]
Fair value of pension assets
Total assets at fair value	139.3	132.1
Debt Securities Issued by Non-U.S. Government and Government Agencies [Member] | Derivatives (Level 1 Measurement) [Member]
Fair value of pension assets
Total assets at fair value	139.3	132.1
Corporate Debt Securities [Member]
Fair value of pension assets
Total assets at fair value	180.8	189.7
Corporate Debt Securities [Member] | Derivatives (Level 1 Measurement) [Member]
Fair value of pension assets
Total assets at fair value	180.8	189.7
Other Asset-Backed Securities [Member]
Fair value of pension assets
Total assets at fair value		0.2
Other Asset-Backed Securities [Member] | Derivatives (Level 1 Measurement) [Member]
Fair value of pension assets
Total assets at fair value		0.2
Equity Securities Held for Proprietary Investment Purposes [Member]
Fair value of pension assets
Total assets at fair value	84.2	125.0
Equity Securities Held for Proprietary Investment Purposes [Member] | Derivatives (Level 1 Measurement) [Member]
Fair value of pension assets
Total assets at fair value	84.2	125.0
Real Estate [Member]
Fair value of pension assets
Total assets at fair value	57.1	64.7
Real Estate [Member] | Derivatives (Level 1 Measurement) [Member]
Fair value of pension assets
Total assets at fair value	57.1	64.7
Insurance Contracts [Member]
Fair value of pension assets
Total assets at fair value	152.9	171.9
Insurance Contracts [Member] | Non-financial Assets and Liabilities (Level 3 Measurement) [Member]
Fair value of pension assets
Total assets at fair value	152.9	171.9
Investments Measured At Net Asset Value [Member]
Fair value of pension assets
Total assets at fair value	51.7	47.6
Other Assets [Member]
Fair value of pension assets
Total assets at fair value	26.2	31.6
Other Assets [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair value of pension assets
Total assets at fair value	$ 26.2	$ 31.6

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- Definition

Defined benefit plan cash.

+ References

No definition available.

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- Definition

This represents the entire assets recognized in the balance sheet that are associated with the defined benefit plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.10)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.10)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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- Definition

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
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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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