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Income Taxes - Reconciliation of Liability for Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Gross Unrecognized Income Tax Benefits
Gross unrecognized income tax benefits, Beginning Balance	$ 0.9	$ 0.3
Gross amount of decreases in unrecognized tax benefits related to prior periods			$ (0.4)
Decreases in unrecognized tax benefits relating to settlements with taxing authorities			(2.1)
Gross amount of increases in unrecognized tax benefits related to prior periods		0.8
Reductions to unrecognized tax benefits as a result of a lapse of the applicable statute of limitations	(0.5)	(0.2)
Gross unrecognized income tax benefits, Ending Balance	0.4	0.9	$ 0.3
Accrued Interest and Penalties
Unrecognized Tax Benefits, Accrued interest and penalties, Beginning Balance	0.1
Gross amount of increases in unrecognized tax benefits related to prior periods		0.1
Unrecognized Tax Benefits, Accrued interest and penalties, Ending Balance	$ 0.1	$ 0.1

X

- Definition

Accrued interest and penalties associated with the gross amount of increases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns.

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Amount of unrecognized tax benefits.

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount accrued 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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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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