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Income Taxes - Tax Cuts and Jobs Act (Details) - USD ($) $ in Millions			12 Months Ended
	Jan. 01, 2018	Dec. 22, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Effect of Tax Cuts and Jobs Act of 2017 Accounting Incomplete Provisional [Abstract]
U.S. Federal statutory tax rate	21.00%	35.00%	21.00%	34.00%	34.00%
Tax benefit related to remeasurement			$ (15.2)
Valuation allowance offset to remeasurement tax benefit			$ 15.2

X

- Definition

n/a

+ References

No definition available.

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- Definition

Amount of reasonable estimate for the increase (decrease) in income tax expense (benefit) attributable to the increase (decrease) in the valuation allowance for remeasurement of deferred tax from change in tax rate pursuant to the Tax Cut And Jobs Act of 2017 for which accounting is incomplete.

+ References

No definition available.

+ Details

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- Definition

Amount of reasonable estimate for income tax expense (benefit) from effect of Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete.

+ References

No definition available.

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- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I)
-URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319

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