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Litigation and Regulatory Contingencies (Narrative) (Detail) - Canadian Taxing Authority $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($)
Minimum
Income Tax Examination [Line Items]
Income tax authority assessment	$ 12.0
Maximum
Income Tax Examination [Line Items]
Income tax authority assessment	$ 12.8

X

- Definition

Estimated amount of loss resulting from an adverse tax position.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (d)(3)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319

+ Details

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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