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Income Taxes - Components of unrecognized tax positions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Highly certain tax positions	$ 7.9	$ 8.3	$ 6.3
Other unrecognized tax benefits	1.6	0.1	0.1
Gross unrecognized tax benefits	9.5	8.4	6.4	$ 3.8
Accrued interest and penalties related to unrecognized tax positions	$ 0.1	$ 0.0	$ 0.0

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The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (d)
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Amount of unrecognized tax benefits.

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Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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