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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2019	Dec. 31, 2018
Income Tax Contingency [Line Items]
Income tax expense	$ 4.9	$ 3.9	$ 2.9	$ 5.5
Effective income tax rate (percent)	25.10%	26.70%	15.70%	26.30%
Liability for gross unrecognized tax benefits	$ 2.1		$ 2.1			$ 2.3
Unrecognized tax benefit that would impact effective tax rate	$ 1.6		$ 1.6			$ 0.1
Forecast
Income Tax Contingency [Line Items]
Effective income tax rate (percent)					21.00%

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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