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Pension and Post-employment Benefits - Fair Value of Pension Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair value of pension assets
Total plan assets	$ 116.0	$ 48.0
United Kingdom Plan [Member]
Fair value of pension assets
Total assets at fair value	762.4	692.4
Cash	75.0	65.8
Total plan assets	837.4	758.2	$ 795.2
United Kingdom Plan [Member] | Derivatives (Level 1 Measurement) [Member]
Fair value of pension assets
Total assets at fair value	315.0	461.6
Cash	75.0	65.8
Total plan assets	390.0	527.4
United Kingdom Plan [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair value of pension assets
Total assets at fair value	232.3	26.2
Total plan assets	232.3	26.2
United Kingdom Plan [Member] | Non-financial Assets and Liabilities (Level 3 Measurement) [Member]
Fair value of pension assets
Total assets at fair value	162.8	152.9
Total plan assets	162.8	152.9
United Kingdom Plan [Member] | Debt Securities Issued by U.S. Government and Government Agencies [Member]
Fair value of pension assets
Total assets at fair value		0.2
United Kingdom Plan [Member] | 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
United Kingdom Plan [Member] | Debt Securities Issued by Non-U.S. Government and Government Agencies [Member]
Fair value of pension assets
Total assets at fair value	86.0	139.3
United Kingdom Plan [Member] | 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	86.0	139.3
United Kingdom Plan [Member] | Corporate Debt Securities [Member]
Fair value of pension assets
Total assets at fair value	426.8	180.8
United Kingdom Plan [Member] | Corporate Debt Securities [Member] | Derivatives (Level 1 Measurement) [Member]
Fair value of pension assets
Total assets at fair value	194.5	180.8
United Kingdom Plan [Member] | Corporate Debt Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair value of pension assets
Total assets at fair value	232.3
United Kingdom Plan [Member] | Other Asset-Backed Securities [Member] | Derivatives (Level 1 Measurement) [Member]
Fair value of pension assets
Total assets at fair value		0.0
United Kingdom Plan [Member] | Equity Securities Held for Proprietary Investment Purposes [Member]
Fair value of pension assets
Total assets at fair value	0.1	84.2
United Kingdom Plan [Member] | Equity Securities Held for Proprietary Investment Purposes [Member] | Derivatives (Level 1 Measurement) [Member]
Fair value of pension assets
Total assets at fair value	0.1	84.2
United Kingdom Plan [Member] | Real Estate [Member]
Fair value of pension assets
Total assets at fair value	34.4	57.1
United Kingdom Plan [Member] | Real Estate [Member] | Derivatives (Level 1 Measurement) [Member]
Fair value of pension assets
Total assets at fair value	34.4	57.1
United Kingdom Plan [Member] | Insurance Contracts [Member]
Fair value of pension assets
Total assets at fair value	162.8	152.9
United Kingdom Plan [Member] | Insurance Contracts [Member] | Non-financial Assets and Liabilities (Level 3 Measurement) [Member]
Fair value of pension assets
Total assets at fair value	162.8	152.9
United Kingdom Plan [Member] | Investments Measured At Net Asset Value [Member]
Fair value of pension assets
Total assets at fair value	$ 52.3	51.7
United Kingdom Plan [Member] | Other Plan Assets [Member]
Fair value of pension assets
Total assets at fair value		26.2
United Kingdom Plan [Member] | Other Plan Assets [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair value of pension assets
Total assets at fair value		$ 26.2

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- Definition

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+ References

No definition available.

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- Definition

Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
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-Section S99
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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

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