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Discontinued Operations - Narrative (Details) - Discontinued Operations - Disposed of by Sale - NATG - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Professional fees, facility costs and tax benefits	$ 0.1
Restitution receipts			$ 15.0	$ 1.9
Benefit from resolution of payable accounts			2.4
Professional fees and facility costs		$ 0.1	3.6	0.8
Tax effect of discontinued operation		0.2	3.3	0.5
Accounts payable and other liabilities	41.0		41.0
Vendor settlements		$ 0.8		$ 0.9
Maximum
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Additional charges (less than)	$ 0.5		$ 0.5

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

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