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Pension and Post-Employment Benefits - Fair Value of Pension Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Fair value of pension assets
Total plan assets	$ 95.9	$ 116.0
United Kingdom Plan [Member]
Fair value of pension assets
Total assets at fair value	701.0	762.4
Cash	38.1	75.0
Total plan assets	739.1	837.4	$ 758.2
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	67.2	86.0
United Kingdom Plan [Member] | Corporate Debt Securities [Member]
Fair value of pension assets
Total assets at fair value	406.4	426.8
United Kingdom Plan [Member] | Equity Securities Held for Proprietary Investment Purposes [Member]
Fair value of pension assets
Total assets at fair value		0.1
United Kingdom Plan [Member] | Real Estate [Member]
Fair value of pension assets
Total assets at fair value	31.4	34.4
United Kingdom Plan [Member] | Insurance Contracts [Member]
Fair value of pension assets
Total assets at fair value	142.5	162.8
United Kingdom Plan [Member] | Investments Measured At Net Asset Value [Member]
Fair value of pension assets
Total assets at fair value	53.0	52.3
United Kingdom Plan [Member] | Other Financial Derivatives [Member]
Fair value of pension assets
Total assets at fair value	0.5
United Kingdom Plan [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value of pension assets
Total assets at fair value	98.6	315.0
Cash	38.1	75.0
Total plan assets	136.7	390.0
United Kingdom Plan [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Debt Securities Issued by Non-U.S. Government and Government Agencies [Member]
Fair value of pension assets
Total assets at fair value	67.2	86.0
United Kingdom Plan [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Corporate Debt Securities [Member]
Fair value of pension assets
Total assets at fair value		194.5
United Kingdom Plan [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities Held for Proprietary Investment Purposes [Member]
Fair value of pension assets
Total assets at fair value		0.1
United Kingdom Plan [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Real Estate [Member]
Fair value of pension assets
Total assets at fair value	31.4	34.4
United Kingdom Plan [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair value of pension assets
Total assets at fair value	406.9	232.3
Total plan assets	406.9	232.3
United Kingdom Plan [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate Debt Securities [Member]
Fair value of pension assets
Total assets at fair value	406.4	232.3
United Kingdom Plan [Member] | Significant Other Observable Inputs (Level 2) [Member] | Other Financial Derivatives [Member]
Fair value of pension assets
Total assets at fair value	0.5
United Kingdom Plan [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair value of pension assets
Total assets at fair value	142.5	162.8
Total plan assets	142.5	162.8
United Kingdom Plan [Member] | Significant Unobservable Inputs (Level 3) [Member] | Insurance Contracts [Member]
Fair value of pension assets
Total assets at fair value	$ 142.5	$ 162.8

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