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Income Taxes (Taxes by Jurisdiction) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Current Income Tax Expense (Benefit)									$ 0.5	$ 0.3
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability									(1.9)	0.0
Provision (benefit) for income taxes	$ (0.8)	$ (0.2)	$ (0.5)	$ 0.1	$ 0.4	$ 0.0	$ 0.0	$ (0.1)	(1.4)	0.3
State and Local Jurisdiction [Member]
Current Income Tax Expense (Benefit)									0.5	0.2
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability									(1.9)	0.0
Foreign Tax Authority [Member]
Current Income Tax Expense (Benefit)									$ 0.0	$ 0.1

X

- Definition

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

+ References

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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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Amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity.

+ References

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