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Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Sep. 30, 2018
Income Taxes
Potential decrease in unrecognized tax benefit		$ 0.9
Tax cuts and jobs act, income tax benefit	$ 53.4
Other Comprehensive Income (Loss)
Income Taxes
Tax cuts and jobs act, income tax benefit	0.3
Continuing Operations
Income Taxes
Tax cuts and jobs act, income tax benefit	57.7
Discontinued Operations
Income Taxes
Tax cuts and jobs act, income tax benefit	$ 4.6

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- Definition

Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Provisional Income Tax Expense (Benefit)

+ References

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- Definition

Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

+ 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

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