Supplemental Cash Flow Information (Narrative) (Details) - DNI [Member] - Discontinued (Note 2) [Member] $ in Millions	1 Months Ended
Mar. 31, 2019 USD ($)
Percentage of ownership interest prior to disposal	55.00%
Percentage of ownership interest after disposal	38.00%
Consideration received	$ 27.6
Settlement of contingent consideration	$ 27.6

Percent, after disposal, of ownership interest of a discontinued operation in which an equity method investment is retained.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 4B
-Subparagraph (d)(3)
-URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721665-107760

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- Definition

Percent, prior to disposal, of ownership interest of a discontinued operation in which an equity method investment is retained.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 4B
-Subparagraph (d)(2)
-URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721665-107760

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- Definition

Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

+ References

No definition available.

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- Definition

Gross amount of debt extinguished.

+ References

No definition available.

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Balance Type:	debit
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