Income Taxes - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income tax expense	$ 7.9	$ 6.5	$ 25.4	$ 18.9
Excess tax benefit from completion of tax audit	0.6		$ 0.6
Excess tax benefit from stock compensation activity	$ 0.6
Effective tax rate	21.80%	23.00%	24.40%	23.50%

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

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Amount of tax benefit from exercise of stock options granted under share-based compensation arrangement.

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The amount of the additional liability or refund received or expected based on a final settlement with a taxing authority.

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

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