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Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Mar. 31, 2017
Income Taxes [Line Items]
Income Tax Benefit - Impact of Tax Legislation	$ 60.1
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority	$ 1.1	$ 2.4
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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- 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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

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- Definition

The amount of the additional liability or refund received or expected based on a final settlement with a taxing authority.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (3)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319

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