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Employee Benefit and Retirement Plans - Composition of Domestic Pension Plan Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
United States Pension Plan of US Entity [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | $ 1,271.1 | $ 1,230.6 |
United States Pension Plan of US Entity [Member] | Fair Value [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 842.9 | 674.3 |
United States Pension Plan of US Entity [Member] | Portion at Other than Fair Value Measurement [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 428.2 | 556.3 |
United States Pension Plan of US Entity [Member] | Equity Securities [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 134.5 | 270.4 |
United States Pension Plan of US Entity [Member] | Equity Securities [Member] | Fair Value [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 129.8 | 149.8 |
United States Pension Plan of US Entity [Member] | Equity Securities [Member] | Portion at Other than Fair Value Measurement [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 4.7 | 120.6 |
United States Pension Plan of US Entity [Member] | International Equity [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 159.8 | 181.6 |
United States Pension Plan of US Entity [Member] | International Equity [Member] | Fair Value [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 75.5 | 80.4 |
United States Pension Plan of US Entity [Member] | International Equity [Member] | Portion at Other than Fair Value Measurement [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 84.3 | 101.2 |
United States Pension Plan of US Entity [Member] | Fixed Income Securities [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 602.9 | 583.7 |
United States Pension Plan of US Entity [Member] | Fixed Income Securities [Member] | Fair Value [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 395.4 | 372.7 |
United States Pension Plan of US Entity [Member] | Fixed Income Securities [Member] | Portion at Other than Fair Value Measurement [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 207.5 | 211.0 |
United States Pension Plan of US Entity [Member] | Alternative Investments [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 173.7 | 166.1 |
United States Pension Plan of US Entity [Member] | Alternative Investments [Member] | Fair Value [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 42.0 | 42.6 |
United States Pension Plan of US Entity [Member] | Alternative Investments [Member] | Portion at Other than Fair Value Measurement [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 131.7 | 123.5 |
United States Pension Plan of US Entity [Member] | Cash and Other Investments [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 200.2 | 28.8 |
United States Pension Plan of US Entity [Member] | Cash and Other Investments [Member] | Fair Value [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 200.2 | 28.8 |
Level 1 [Member] | United States Pension Plan of US Entity [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 808.4 | 638.9 |
Level 1 [Member] | United States Pension Plan of US Entity [Member] | Equity Securities [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 129.8 | 149.8 |
Level 1 [Member] | United States Pension Plan of US Entity [Member] | International Equity [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 75.5 | 80.4 |
Level 1 [Member] | United States Pension Plan of US Entity [Member] | Fixed Income Securities [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 395.4 | 372.7 |
Level 1 [Member] | United States Pension Plan of US Entity [Member] | Alternative Investments [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 23.8 | 23.5 |
Level 1 [Member] | United States Pension Plan of US Entity [Member] | Cash and Other Investments [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 183.9 | 12.5 |
Level 2 [Member] | United States Pension Plan of US Entity [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 15.2 | 15.2 |
Level 2 [Member] | United States Pension Plan of US Entity [Member] | Cash and Other Investments [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 15.2 | 15.2 |
Level 3 [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 33.0 | 39.0 | $ 26.9
Level 3 [Member] | United States Pension Plan of US Entity [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 19.3 | 20.2 |
Level 3 [Member] | United States Pension Plan of US Entity [Member] | Alternative Investments [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 18.2 | 19.1 |
Level 3 [Member] | United States Pension Plan of US Entity [Member] | Cash and Other Investments [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | $ 1.1 | $ 1.1 |

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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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