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Discontinued Operations - Summarized Results of Discontinued Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Discontinued Operations and Disposal Groups [Abstract]
(Loss) income from discontinued operations, net of income taxes	$ (14.0)	$ 3.2	$ 18.1
Significant revenues from discontinued operations	$ 0.0	$ 0.0	$ 0.0

Amount after tax of income (loss) from a discontinued operation including the portion attributable to the noncontrolling interest. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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