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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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