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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

Pension Plans, Postretirement and Other Employee Benefits [Line Items]

+ References

No definition available.

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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

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