Income Taxes - Income Before Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Line Items]
Income (loss) before income taxes	$ 86.1	$ 89.9	$ (25.1)
Domestic
Income Taxes [Line Items]
Income (loss) before income taxes	85.5	89.6	(29.6)
Foreign
Income Taxes [Line Items]
Income (loss) before income taxes	$ 0.6	$ 0.3	$ 4.5