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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018
Income Tax Contingency [Line Items]
Income tax expense	$ 6.4	$ 4.2	$ 9.3	$ 9.7
Effective income tax rate (percent)	25.50%	16.00%	21.30%	20.60%
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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Amount of unrecognized tax benefits.

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