Income Taxes - Valuation allowance (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Taxes
Valuation allowance beginning of the year	$ 4.2	$ 4.3	$ 0.0
Increases (decreases) recorded as a loss (benefit) to income tax provision		(0.1)	1.3
Increases recorded as part of acquisition purchase accounting	2.4		3.0
Valuation allowance end of the year	$ 6.6	$ 4.2	$ 4.3

Amount of increase (decrease) in the valuation allowance for a acquisition purchase accounting.

No definition available.

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- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

+ Details

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Balance Type:	credit
Period Type:	instant

- References

No definition available.

+ Details

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- Definition

Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=116821951&loc=d3e32123-109318

+ Details

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