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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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