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Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018
Income Taxes [Line Items]
Income Tax Benefit - Impact of Tax Legislation	$ 60.1
Equity Method Investment, Ownership Percentage		50.00%

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- Definition

Income Tax Benefit - Impact of Tax Legislation

+ References

No definition available.

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- Definition

[Line Items] for Income Taxes [Table]

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No definition available.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

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