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Pension and Post-Employment Benefits - Fair Value of Pension Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Fair value of pension assets
Total plan assets	$ 115.9	$ 95.9
Non-US [Member]
Fair value of pension assets
Debt securities	787.0	701.0
Cash	29.9	38.1
Total plan assets	816.9	739.1
Non-US [Member] | Debt Securities Issued by Non-U.S. Government and Government Agencies [Member]
Fair value of pension assets
Debt securities	98.4	67.2
Non-US [Member] | Corporate Debt Securities [Member]
Fair value of pension assets
Debt securities	445.9	406.4
Non-US [Member] | Real Estate [Member]
Fair value of pension assets
Debt securities	41.7	31.4
Non-US [Member] | Insurance Contracts [Member]
Fair value of pension assets
Debt securities	157.9	142.5
Non-US [Member] | Investments Measured At Net Asset Value [Member]
Fair value of pension assets
Debt securities	46.8	53.0
Non-US [Member] | Other Financial Derivatives [Member]
Fair value of pension assets
Debt securities	(3.7)	0.5
Non-US [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value of pension assets
Debt securities	140.1	98.6
Cash	29.9	38.1
Total plan assets	170.0	136.7
Non-US [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
Debt securities	98.4	67.2
Non-US [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Real Estate [Member]
Fair value of pension assets
Debt securities	41.7	31.4
Non-US [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair value of pension assets
Debt securities	442.2	406.9
Total plan assets	442.2	406.9
Non-US [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate Debt Securities [Member]
Fair value of pension assets
Debt securities	445.9	406.4
Non-US [Member] | Significant Other Observable Inputs (Level 2) [Member] | Other Financial Derivatives [Member]
Fair value of pension assets
Debt securities	(3.7)	0.5
Non-US [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair value of pension assets
Debt securities	157.9	142.5
Total plan assets	157.9	142.5
Non-US [Member] | Significant Unobservable Inputs (Level 3) [Member] | Insurance Contracts [Member] | Other Asset Backed Securitites [Member]
Fair value of pension assets
Debt securities	$ 157.9	$ 142.5

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