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Employee Benefit and Retirement Plans - Composition of International Pension Plan Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
International [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | $ 621.2 | $ 565.3 |
International [Member] | Fair Value [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 560.9 | 431.5 |
International [Member] | Portion at Other than Fair Value Measurement [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 60.3 | 133.8 |
International [Member] | Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 52.9 | 71.0 |
International [Member] | Equity Securities [Member] | Fair Value [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 38.8 | 26.2 |
International [Member] | Equity Securities [Member] | Portion at Other than Fair Value Measurement [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 14.1 | 44.8 |
International [Member] | Fixed Income Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 273.2 | 215.6 |
International [Member] | Fixed Income Securities [Member] | Fair Value [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 258.8 | 169.3 |
International [Member] | Fixed Income Securities [Member] | Portion at Other than Fair Value Measurement [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 14.4 | 46.3 |
International [Member] | Cash and Other Investments [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 295.1 | 278.7 |
International [Member] | Cash and Other Investments [Member] | Fair Value [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 263.3 | 236.0 |
International [Member] | Cash and Other Investments [Member] | Portion at Other than Fair Value Measurement [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 31.8 | 42.7 |
Level 1 [Member] | International [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 304.3 | 194.9 |
Level 1 [Member] | International [Member] | Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 38.8 | 26.2 |
Level 1 [Member] | International [Member] | Fixed Income Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 258.8 | 164.0 |
Level 1 [Member] | International [Member] | Cash and Other Investments [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 6.7 | 4.7 |
Level 2 [Member] | International [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 242.9 | 217.8 |
Level 2 [Member] | International [Member] | Cash and Other Investments [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 242.9 | 217.8 |
Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 33.0 | 39.0 | $ 26.9
Level 3 [Member] | International [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 13.7 | 18.8 |
Level 3 [Member] | International [Member] | Fixed Income Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets |  | 5.3 |
Level 3 [Member] | International [Member] | Cash and Other Investments [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | $ 13.7 | $ 13.5 |

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