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Employee Benefit and Retirement Plans - Composition of International Pension Plan Assets (Detail) - International [Member] - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	$ 23.4	$ 52.9
Equity Securities [Member] | Fair Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	14.3	38.8
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	9.1	14.1
Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	273.3	273.2
Fixed Income Securities [Member] | Fair Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	266.7	258.8
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	6.6	14.4
Cash and Other Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	226.9	276.0
Cash and Other Investments [Member] | Fair Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	212.6	244.2
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	14.3	31.8
Fair Value Of Plan Assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	523.6	602.1
Fair Value Of Plan Assets [Member] | Fair Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	493.6	541.8
Fair Value Of Plan Assets [Member] | Portion at Other than Fair Value Measurement [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	30.0	60.3
Level 1 [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	14.3	38.8
Level 1 [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	266.7	258.8
Level 1 [Member] | Cash and Other Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	6.2	5.1
Level 1 [Member] | Fair Value Of Plan Assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	287.2	302.7
Level 2 [Member] | Cash and Other Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	204.9	233.7
Level 2 [Member] | Fair Value Of Plan Assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	204.9	233.7
Level 3 [Member] | Cash and Other Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	1.5	5.4
Level 3 [Member] | Fair Value Of Plan Assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	$ 1.5	$ 5.4

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- Definition

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+ References

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(ii)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

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