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Income Taxes (Schedule of Unrecognized Tax Benefits Roll Forward) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits - Opening Balance	$ 23.2	$ 1.2	$ 1.4
Gross decreases - tax positions in prior period	(1.5)	(0.6)	(0.4)
Gross increases - current period tax positions	0.0	22.6	0.2
Unrecognized Tax Benefits - Ending Balance	21.7	23.2	1.2
Offset for net operating loss carryforwards	(21.7)	(22.6)	0.0
Balance - Less Net Operating Loss Carryforwards	$ 0.0	$ 0.6	$ 1.2

X

- Definition

Unrecognized Tax Benefits Net of Refunds and Net Operating Loss Carryforwards

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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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 of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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